Game don't start after patch

I have installed the patch with the patcher and the game don't run I have a black screen and nothing happen....
I am on windows 8.1 and the steam version.
Please help me because episode 1 and 2 run perfectly

The issue describes a black screen on Windows 8.1 with the Steam version after applying a patch. Start by checking the patch application logs or the game's error logs. Look for any recent changes in the repository related to Windows compatibility or the patcher. Testing on a similar environment and comparing with working episodes might help identify the root cause.

Written by the indexing model from the issue text.