HoMM3 HD bug reports.

The game doesn't even launch after the update through the launcher. It displays error code = 267 when launching Heroes3 HD, and the launcher itself doesn't start.

The log shows:
HOMM3 HD version: 3.714.

It seems like something is updating incorrectly. It looks like not all the files needed for proper operation are being updated. This is causing the launcher to crash.

Added 57 minutes later

P.S. You can try installing it directly instead of using the updater:
https://sites.google.com/site/heroes3hd/rus/download