diff --git a/README.md b/README.md
index f6e2f2d..69199b9 100644
--- a/README.md
+++ b/README.md
@@ -48,7 +48,7 @@ The uploaded artifact is the whole build folder, so companion files such as a `.
 
 | Input | Required | Default | Description |
 | --- | --- | --- | --- |
-| `godot-version` | Yes | — | The Godot 4 release tag to use, without the leading `v`; for example, `4.7.2-stable`. |
+| `godot-version` | Yes | — | A stable Godot 4 release tag, without the leading `v`; for example, `4.7.2-stable`. Alpha, beta, RC, and dev tags are unsupported. |
 | `host-os` | Yes | — | The machine running the job: `linux`, `macos`, or `windows`. The action checks this before it starts. |
 | `host-arch` | Yes | — | The runner's architecture. Linux supports `x86_32`, `x86_64`, `arm32`, and `arm64`; Windows supports `x86_32`, `x86_64`, and `arm64`; macOS supports `x86_64` and `arm64`. |
 | `export-preset` | Yes | — | The preset name exactly as it appears in `export_presets.cfg`. |
@@ -67,7 +67,8 @@ The uploaded artifact is the whole build folder, so companion files such as a `.
 ## A few helpful notes
 
 - Your project needs both `project.godot` and `export_presets.cfg`. Preset names with spaces, such as `Windows Desktop`, are fine.
-- Downloads are checked against Godot's published `SHA512-SUMS.txt` file before anything is extracted.
+- Editor and template downloads come from the [official Godot stable-release assets](https://github.com/godotengine/godot/releases) and are checked against that release's `SHA512-SUMS.txt` before anything is extracted. If a release does not provide an editor for the requested runner architecture, the action fails before downloading either archive.
+- Linux ARM downloads require Godot 4.2 or newer; Windows ARM64 downloads require Godot 4.3 or newer. macOS uses the universal editor archive on both supported architectures.
 - On Linux, make sure the runner has `curl`, `unzip`, and `sha512sum`. macOS needs `curl`, `unzip`, and `shasum`. Windows uses the archive and hashing tools built into PowerShell.
 - The cache includes the editor and the full export-template package. Gitea keeps that cache on each runner by default; an administrator can configure shared storage if several runners should reuse it.
 - This action installs Godot, not every SDK around it. Android, iOS, console, and other platform-specific presets may still need their own SDKs, credentials, or signing setup on the runner.
diff --git a/action.yml b/action.yml
index babdfd3..0a55538 100644
--- a/action.yml
+++ b/action.yml
@@ -3,7 +3,7 @@ description: Download and cache Godot 4, install export templates, and export a
 
 inputs:
   godot-version:
-    description: Exact Godot 4 release tag without a leading v (for example, 4.6.1-stable).
+    description: Exact stable Godot 4 release tag without a leading v (for example, 4.6.1-stable). Prerelease tags are unsupported.
     required: true
   host-os:
     description: "Runner operating system: linux, macos, or windows."
diff --git a/export-linux.sh b/export-linux.sh
index 9214930..8162db3 100644
--- a/export-linux.sh
+++ b/export-linux.sh
@@ -16,7 +16,7 @@ require_environment() {
 }
 
 validate_common_inputs() {
-  [[ "$GODOT_VERSION" =~ ^4(\.[0-9]+){1,2}(-[0-9A-Za-z][0-9A-Za-z._-]*)?$ ]] || fail "godot-version must be a Godot 4 release tag such as 4.7.2-stable."
+  [[ "$GODOT_VERSION" =~ ^4(\.[0-9]+){1,2}-stable$ ]] || fail "godot-version must be a stable Godot 4 tag such as 4.7.2-stable. Alpha, beta, RC, and dev tags are not supported."
   [[ "$GODOT_HOST_OS" == "linux" ]] || fail "host-os must be 'linux' when this action runs on Linux."
   [[ "$GODOT_DOTNET" == "true" || "$GODOT_DOTNET" == "false" ]] || fail "dotnet must be 'true' or 'false'."
   [[ "$GODOT_EXPORT_MODE" == "release" || "$GODOT_EXPORT_MODE" == "debug" ]] || fail "export-mode must be 'release' or 'debug'."
@@ -35,16 +35,23 @@ actual_architecture() {
   esac
 }
 
+release_asset_checksum() {
+  local asset="$1"
+  local sum_file="$2"
+  local expected
+
+  expected="$(awk -v asset="$asset" '$2 == asset || $2 == "*" asset { print $1; exit }' "$sum_file")"
+  [[ -n "$expected" ]] || fail "Godot $GODOT_VERSION does not publish required $EDITION asset '$asset' for Linux/$GODOT_HOST_ARCH at $BASE_URL. Choose a supported stable release and architecture."
+  printf '%s\n' "$expected"
+}
+
 download_and_verify() {
   local asset="$1"
   local destination="$2"
-  local sum_file="$3"
-  local expected
+  local expected="$3"
   local actual
 
   curl --fail --location --retry 3 --silent --show-error "$BASE_URL/$asset" --output "$destination"
-  expected="$(awk -v asset="$asset" '$2 == asset || $2 == "*" asset { print $1; exit }' "$sum_file")"
-  [[ -n "$expected" ]] || fail "Release checksum manifest does not contain $asset."
   actual="$(sha512sum "$destination" | awk '{ print $1 }')"
   [[ "$actual" == "$expected" ]] || fail "SHA-512 verification failed for $asset."
 }
@@ -57,12 +64,16 @@ install_godot() {
   local sum_file="$CACHE_DIR/SHA512-SUMS.txt"
   local editor_archive="$CACHE_DIR/$EDITOR_ASSET"
   local templates_archive="$CACHE_DIR/$TEMPLATES_ASSET"
+  local editor_checksum
+  local templates_checksum
 
   rm -rf "$CACHE_DIR"
   mkdir -p "$EDITOR_DIR" "$TEMPLATE_DIR"
   curl --fail --location --retry 3 --silent --show-error "$BASE_URL/SHA512-SUMS.txt" --output "$sum_file"
-  download_and_verify "$EDITOR_ASSET" "$editor_archive" "$sum_file"
-  download_and_verify "$TEMPLATES_ASSET" "$templates_archive" "$sum_file"
+  editor_checksum="$(release_asset_checksum "$EDITOR_ASSET" "$sum_file")"
+  templates_checksum="$(release_asset_checksum "$TEMPLATES_ASSET" "$sum_file")"
+  download_and_verify "$EDITOR_ASSET" "$editor_archive" "$editor_checksum"
+  download_and_verify "$TEMPLATES_ASSET" "$templates_archive" "$templates_checksum"
   unzip -q "$editor_archive" -d "$EDITOR_DIR"
   unzip -q "$templates_archive" -d "$TEMPLATE_DIR"
   EDITOR_EXECUTABLE="$(find_editor)"
@@ -113,7 +124,7 @@ else
   TEMPLATES_ASSET="Godot_v${GODOT_VERSION}_export_templates.tpz"
 fi
 
-BASE_URL="https://github.com/godotengine/godot-builds/releases/download/$GODOT_VERSION"
+BASE_URL="https://github.com/godotengine/godot/releases/download/$GODOT_VERSION"
 TEMPLATE_VERSION="${GODOT_VERSION//-/.}"
 CACHE_DIR="$GODOT_ACTION_ROOT/cache/$GODOT_VERSION/$EDITION/linux-$GODOT_HOST_ARCH"
 EDITOR_DIR="$CACHE_DIR/editor"
diff --git a/export-macos.sh b/export-macos.sh
index 8e549f4..9dbce41 100644
--- a/export-macos.sh
+++ b/export-macos.sh
@@ -16,7 +16,7 @@ require_environment() {
 }
 
 validate_common_inputs() {
-  [[ "$GODOT_VERSION" =~ ^4(\.[0-9]+){1,2}(-[0-9A-Za-z][0-9A-Za-z._-]*)?$ ]] || fail "godot-version must be a Godot 4 release tag such as 4.7.2-stable."
+  [[ "$GODOT_VERSION" =~ ^4(\.[0-9]+){1,2}-stable$ ]] || fail "godot-version must be a stable Godot 4 tag such as 4.7.2-stable. Alpha, beta, RC, and dev tags are not supported."
   [[ "$GODOT_HOST_OS" == "macos" ]] || fail "host-os must be 'macos' when this action runs on macOS."
   [[ "$GODOT_DOTNET" == "true" || "$GODOT_DOTNET" == "false" ]] || fail "dotnet must be 'true' or 'false'."
   [[ "$GODOT_EXPORT_MODE" == "release" || "$GODOT_EXPORT_MODE" == "debug" ]] || fail "export-mode must be 'release' or 'debug'."
@@ -33,16 +33,23 @@ actual_architecture() {
   esac
 }
 
+release_asset_checksum() {
+  local asset="$1"
+  local sum_file="$2"
+  local expected
+
+  expected="$(awk -v asset="$asset" '$2 == asset || $2 == "*" asset { print $1; exit }' "$sum_file")"
+  [[ -n "$expected" ]] || fail "Godot $GODOT_VERSION does not publish required $EDITION asset '$asset' for macOS/$GODOT_HOST_ARCH at $BASE_URL. Choose a supported stable release and architecture."
+  printf '%s\n' "$expected"
+}
+
 download_and_verify() {
   local asset="$1"
   local destination="$2"
-  local sum_file="$3"
-  local expected
+  local expected="$3"
   local actual
 
   curl --fail --location --retry 3 --silent --show-error "$BASE_URL/$asset" --output "$destination"
-  expected="$(awk -v asset="$asset" '$2 == asset || $2 == "*" asset { print $1; exit }' "$sum_file")"
-  [[ -n "$expected" ]] || fail "Release checksum manifest does not contain $asset."
   actual="$(shasum -a 512 "$destination" | awk '{ print $1 }')"
   [[ "$actual" == "$expected" ]] || fail "SHA-512 verification failed for $asset."
 }
@@ -55,12 +62,16 @@ install_godot() {
   local sum_file="$CACHE_DIR/SHA512-SUMS.txt"
   local editor_archive="$CACHE_DIR/$EDITOR_ASSET"
   local templates_archive="$CACHE_DIR/$TEMPLATES_ASSET"
+  local editor_checksum
+  local templates_checksum
 
   rm -rf "$CACHE_DIR"
   mkdir -p "$EDITOR_DIR" "$TEMPLATE_DIR"
   curl --fail --location --retry 3 --silent --show-error "$BASE_URL/SHA512-SUMS.txt" --output "$sum_file"
-  download_and_verify "$EDITOR_ASSET" "$editor_archive" "$sum_file"
-  download_and_verify "$TEMPLATES_ASSET" "$templates_archive" "$sum_file"
+  editor_checksum="$(release_asset_checksum "$EDITOR_ASSET" "$sum_file")"
+  templates_checksum="$(release_asset_checksum "$TEMPLATES_ASSET" "$sum_file")"
+  download_and_verify "$EDITOR_ASSET" "$editor_archive" "$editor_checksum"
+  download_and_verify "$TEMPLATES_ASSET" "$templates_archive" "$templates_checksum"
   unzip -q "$editor_archive" -d "$EDITOR_DIR"
   unzip -q "$templates_archive" -d "$TEMPLATE_DIR"
   EDITOR_EXECUTABLE="$(find_editor)"
@@ -111,7 +122,7 @@ else
   TEMPLATES_ASSET="Godot_v${GODOT_VERSION}_export_templates.tpz"
 fi
 
-BASE_URL="https://github.com/godotengine/godot-builds/releases/download/$GODOT_VERSION"
+BASE_URL="https://github.com/godotengine/godot/releases/download/$GODOT_VERSION"
 TEMPLATE_VERSION="${GODOT_VERSION//-/.}"
 CACHE_DIR="$GODOT_ACTION_ROOT/cache/$GODOT_VERSION/$EDITION/macos-$GODOT_HOST_ARCH"
 EDITOR_DIR="$CACHE_DIR/editor"
diff --git a/export-windows.ps1 b/export-windows.ps1
index 6ae13f5..fcd5f8b 100644
--- a/export-windows.ps1
+++ b/export-windows.ps1
@@ -35,16 +35,15 @@ function Get-Checksum([string]$ManifestPath, [string]$Asset) {
         $_ -match '^([0-9A-Fa-f]{128})\s+\*?(.+)$' -and $Matches[2] -eq $Asset
     } | Select-Object -First 1
     if (-not $line) {
-        Fail "Release checksum manifest does not contain $Asset."
+        Fail "Godot $GodotVersion does not publish required $edition asset '$Asset' for Windows/$HostArch at $script:BaseUrl. Choose a supported stable release and architecture."
     }
     return ($line -split '\s+')[0].ToLowerInvariant()
 }
 
-function Download-AndVerify([string]$Asset, [string]$Destination, [string]$ManifestPath) {
+function Download-AndVerify([string]$Asset, [string]$Destination, [string]$ExpectedChecksum) {
     Invoke-WebRequest -Uri "$script:BaseUrl/$Asset" -OutFile $Destination
-    $expected = Get-Checksum $ManifestPath $Asset
     $actual = (Get-FileHash -LiteralPath $Destination -Algorithm SHA512).Hash.ToLowerInvariant()
-    if ($actual -ne $expected) {
+    if ($actual -ne $ExpectedChecksum) {
         Fail "SHA-512 verification failed for $Asset."
     }
 }
@@ -69,7 +68,7 @@ $ActionRoot = Require-Environment 'GODOT_ACTION_ROOT'
 $Workspace = Require-Environment 'GITHUB_WORKSPACE'
 $GithubOutput = Require-Environment 'GITHUB_OUTPUT'
 
-if ($GodotVersion -notmatch '^4(\.[0-9]+){1,2}(-[0-9A-Za-z][0-9A-Za-z._-]*)?$') { Fail 'godot-version must be a Godot 4 release tag such as 4.7.2-stable.' }
+if ($GodotVersion -notmatch '^4(\.[0-9]+){1,2}-stable$') { Fail 'godot-version must be a stable Godot 4 tag such as 4.7.2-stable. Alpha, beta, RC, and dev tags are not supported.' }
 if ($HostOs -ne 'windows') { Fail "host-os must be 'windows' when this action runs on Windows." }
 if ($Dotnet -notin @('true', 'false')) { Fail "dotnet must be 'true' or 'false'." }
 if ($ExportMode -notin @('release', 'debug')) { Fail "export-mode must be 'release' or 'debug'." }
@@ -106,7 +105,7 @@ if ($Dotnet -eq 'true') {
     $templatesAsset = "Godot_v${GodotVersion}_export_templates.tpz"
 }
 
-$script:BaseUrl = "https://github.com/godotengine/godot-builds/releases/download/$GodotVersion"
+$script:BaseUrl = "https://github.com/godotengine/godot/releases/download/$GodotVersion"
 $templateVersion = $GodotVersion -replace '-', '.'
 $cacheDirectory = Join-Path $ActionRoot "cache\$GodotVersion\$edition\windows-$HostArch"
 $editorDirectory = Join-Path $cacheDirectory 'editor'
@@ -126,8 +125,10 @@ if (-not $editorExecutable) {
     $editorArchive = Join-Path $cacheDirectory $editorAsset
     $templatesArchive = Join-Path $cacheDirectory $templatesAsset
     Invoke-WebRequest -Uri "$script:BaseUrl/SHA512-SUMS.txt" -OutFile $manifestPath
-    Download-AndVerify $editorAsset $editorArchive $manifestPath
-    Download-AndVerify $templatesAsset $templatesArchive $manifestPath
+    $editorChecksum = Get-Checksum $manifestPath $editorAsset
+    $templatesChecksum = Get-Checksum $manifestPath $templatesAsset
+    Download-AndVerify $editorAsset $editorArchive $editorChecksum
+    Download-AndVerify $templatesAsset $templatesArchive $templatesChecksum
     Expand-Archive -LiteralPath $editorArchive -DestinationPath $editorDirectory -Force
     Expand-Archive -LiteralPath $templatesArchive -DestinationPath $templateDirectory -Force
     $editorExecutable = Find-Editor $editorDirectory