Cm 01 02 Save Game Editor - Portable

The r/ChampionshipManager subreddit has a pinned "Tools & Utilities" thread. Inside, a user called "CMRevival" maintains a Google Drive link containing:

This indicates file corruption, usually caused by entering an invalid value (e.g., setting an attribute to 500 when the game maxes out at 20, or setting a transfer budget that exceeds the game's hard-coded financial limit). Restore your backup file and apply more conservative edits. cm 01 02 save game editor portable