I think I followed all steps which I have found so far but the download link for my alpha test isn\'t working.
I uploaded the app 3 days ago, created a google group
If you followed the mentioned instructions and it's still not working, in 2019 make sure to also check the following:
1) Make sure the testing group is selected, but is also active:
2) Ask your testers to log out of their google account, then to clear the cache of their browser. They should then close/re-open the browser and log in into the invited email address.