We'll do our best!
Made sure we had backed up all of our current Workspaces from Shapr3D
Went to the email grabbed the registration code and clicked on the link
Downloaded TestFlight put in the code
Hit Open when the download was finished
Had already closed all other open Apps
Shapr would open to the flash screen but wouldn't go any further
The iPad would freeze up, pressed the Home Button a couple of time and things would snap back to life
Went through this a couple of times
Decided to Delete the original version of Shapr3D that we had downloaded through the App Store
Also Deleted and re downloaded TestFlight and the Beta of Shapr3D
Did a HardRestart, relaunched the Beta of Shapr3D and it's been humming along ok!
Imagine just deleting the original version first and then downloading TestFlight might do the trick
Hope this helps