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I just tried to do it with the latest version of SubSurface, but "verifify failed".
Something to try ?
thank you

I'm like all of you with the same problem :
- impossible to update to 10.21
- strange message instead of "veryfy" or "XX%"
- Same thing with Companion 1.2 : verification failed
- Idem with SubSurface : verification failed

Now downloading last version of SubSurface for Mac to make a try.
I'll tell ...

After a few manipulation, I can connect to Companion.

I try with SubSurface but was not able to upgrade to 10.21, the process stop in the middle.
the strange message like in the photo of the first message appears again on the OSTC during the process.

Some more idea ?
Thank you

EDIT : move on ...

Something new (and bad) happen : i cannot connect my Sport to Companion (last and older version).
Did a reset on Sport but nothing change.
Need help please.

OSCT Sport
Hello,
I usually to the upgrade normaly.
This morning I tried to upgrade from 10.20 to 10.21.
During the "verify" time, i Had strange letter in front of verify (picture of the OSTC)
Then, a the end of the process, OSTC Companion send the message : "cannot upgrade : readback is different ...