I want some people install latest version and others install a previous version, so I set the permissions accordingly in hope that user can be automatically directed to the version. However, testFlight always point to latest version and other users will get an error say "You don't have access"... Anyway from device to install a previous version?
Just follow the steps to install previous version.
1 - Go into testflight
2 - Tap on the app for which you want to get the previous version.
3 - After tapping you will see the detail of it and at the bottom you will see the 'Previous Versions' button.
4 - Tap on 'Previous versions.'
5 - A list will be displayed of all the previous version from where you can install any of the previous version.