fix(install): mention alternative installation options

scripts/install/install.ps1

@@ -217,7 +217,7 @@ function Resolve-Release {
     try {
         $releaseMetadata = Invoke-RestMethod -Uri $metadataUri
     } catch {
-        throw "Could not fetch GitHub release metadata for Codex $requestedRelease. GitHub API may be unavailable or rate limited. $($_.Exception.Message)"
+        throw "Could not fetch GitHub release metadata for Codex $requestedRelease. GitHub API may be unavailable or rate limited. $($_.Exception.Message) Consider other installation options https://developers.openai.com/codex/cli"
     }
 
     if ($normalizedVersion -eq "latest") {

scripts/install/install.sh

@@ -152,7 +152,7 @@ resolve_release() {
   fi
 
   if ! release_json="$(download_text "$metadata_url")"; then
-    echo "Could not fetch GitHub release metadata for Codex $requested_release. GitHub API may be unavailable or rate limited." >&2
+    echo "Could not fetch GitHub release metadata for Codex $requested_release. GitHub API may be unavailable or rate limited. Consider other installation options https://developers.openai.com/codex/cli" >&2
     exit 1
   fi
 

scripts/install/test_install_sh.py

@@ -29,6 +29,11 @@ class InstallShTest(unittest.TestCase):
             f"Could not fetch GitHub release metadata for Codex {VERSION}",
             result.stderr,
         )
+        self.assertIn(
+            "Consider other installation options "
+            "https://developers.openai.com/codex/cli",
+            result.stderr,
+        )
         self.assertNotIn("Could not find Codex package", result.stderr)
 
     def test_exact_release_fetches_metadata_once(self) -> None: