Fix copied over (#7270)

Co-authored-by: Douwe Osinga <douwe@squareup.com> - this was approved just need to get it in

download_cli.sh

@@ -197,8 +197,27 @@ DOWNLOAD_URL="https://github.com/$REPO/releases/download/$RELEASE_TAG/$FILE"
 # --- 4) Download & extract 'goose' binary ---
 echo "Downloading $RELEASE_TAG release: $FILE..."
 if ! curl -sLf "$DOWNLOAD_URL" --output "$FILE"; then
-  echo "Error: Failed to download $DOWNLOAD_URL"
-  exit 1
+  # If the download fails, only fall back to latest stable when no version was specified and canary was not requested).
+  if ! [ -n "${GOOSE_VERSION:-}" ] && [ "${CANARY:-false}" != "true" ]; then
+    LATEST_TAG=$(curl -s https://api.github.com/repos/block/goose/releases/latest | \
+      grep '"tag_name":' | sed -E 's/.*"([^"]+)".*/\1/')
+    if [ -z "$LATEST_TAG" ]; then
+      echo "Error: Failed to download $DOWNLOAD_URL and latest tag unavailable"
+      exit 1
+    fi
+
+    DOWNLOAD_URL="https://github.com/$REPO/releases/download/$LATEST_TAG/$FILE"
+    if curl -sLf "$DOWNLOAD_URL" --output "$FILE"; then
+      # Fallback succeeded
+      :
+    else
+      echo "Error: Failed to download from fallback url $DOWNLOAD_URL using latest tag $LATEST_TAG"
+      exit 1
+    fi
+  else
+    echo "Error: Failed to download $DOWNLOAD_URL"
+    exit 1
+  fi
 fi
 
 # Create a temporary directory for extraction