: Set Content-Disposition: attachment; filename="EVDNDD_TNK.zip" to force a browser download.

: Return a 404 error if the TNK assets are unavailable. Timeout : Implement a retry logic for large file bundles.

To write a "Download EVDNDD TNK zip" feature, you'll need to define the technical process for bundling files, serving them via a secure URL, and managing the download state on the front end. Feature Overview

: Return a 403 error if the user's session is expired.

: A visual loading bar or spinner to indicate the file is being prepared. Trigger : User clicks the "Download EVDNDD TNK" button.

If you share the (e.g., Python, Node.js) or the specific contents of the EVDNDD TNK files, I can provide a code snippet for the implementation.

: The backend zips the files in a temporary directory. Delivery : The server streams the bytes to the client.