Zapstore install error

We're all getting this error, when updating from the zapstore.

"Cryptographic identity proof failed. This file may not be from the claimed developer.
Cryptographic identity proof failed

C1 proof signature does not verify."

Start by reproducing the update from Zapstore and capture the full context around the reported cryptographic identity proof failure, including the C1 proof signature error. Trace the update and verification entry points to identify why the claimed developer proof fails; done means Zapstore updates complete without this error and the proof verifies successfully.

Written by the indexing model from the issue text.