Testflight testers getting “unable to download app could not be installed at this time”

Question

I distributed version 1.0, build 1, of my app via TestFlight, and everything worked perfectly.

Yesterday I archived and sent out build 2, and now upon tapping the upd

Answer 1

I was able to fix this problem by removing the 0s from my build number as described here.

As funny as it sounds, TestFlight currently has a bug that prevents deployment if your buildnumber has a 0 in it.

Buildnumber 102 failed to install on all devices I tested it on, simply changing the buildnumber to 112 (nothing else changed!) and uploading it again fixed it immediately.