When you try to start the GTA 5 the error “SCRIPT HOOK V CRITICAL ERROR” appears. There is a way to fix this issue.
How to Fix SCRIPT HOOK V CRITICAL ERROR
You need to delete Script Hook V files. Or if the new version is released, you need to replace the old files with new ones.
You can access the current version of Script Hook V from http://www.dev-c.com/gtav/scripthookv/
If you receive the same error even though you have updated it, a new update has been released to GTA 5 and the version of the script is incompatible with the game.
In this case, you need to wait for the new update to come to Script Hook V.