Does it show up here for you? https://itch.io/my-purchases/bundles
That's apparently where it's supposed to be if it's working.
Yeah, same. My link in the email worked fine from Sunday to Tuesday, then starting Wednesday afternoon it just redirects to the purchase page. I requested a resending of my purchases and the site sent me a list of the products I had already downloaded from the bundle, but I still have no way to access the bundle itself.