If you find the Pre-Game Editor is failing to launch correctly and encountering error messages, make sure to check that the Pre-Game Editor and Football Manager are both installed in their default locations on the same drive.
The Pre-Game Editor requires that Football Manager is installed in order to work. Having the Pre-Game Editor and Football Manager installed on different drives is not officially supported, and cannot be guaranteed to make the Editor work.
To check this:
- Navigate to C:\Program Files (x86)\Steam\steamapps\common
- Ensure that "Football Manager 2018" and "Football Manager 2018 Editor" are both present
- If not then re-install both via Steam