My Takeout Link Expired. What Now?
Request a new export. The links last about a week, and the old archive is deleted afterwards.
Takeout links last roughly a week. After that Google deletes the archive to reclaim the storage, and there is no way to revive the old link.
Go back to takeout.google.com and request the export again. Nothing is lost; it simply has to be built a second time, which takes as long as it did before.
This time, ask for smaller parts and download them as soon as the email arrives. Then fix the dates with Takeout JSON Metadata Fixer. It runs on your own computer and is free for your first 500 photos.