Solution: Make sure you are performing all these checks:
- If the developer provisioning profiles has all test devices added.
- Updated developer provisioning profile is uploaded to quark Appstudio portal.
- Re-buiild app and then download test app on test devices only.
- Test device has sufficient storage space available.
Please Refer:
https://developer.apple.com/library/ios/technotes/tn2319/_index.html#//apple_ref/doc/uid/DTS40013778-CH1-TPRO