Game upgrade, issues in this area.

Good afternoon. I wanted to ask a question about modding. I downloaded Equilibris 3.55. The "City Portal" spell can no longer be used in battle. And that's incredibly annoying. I tried to fix it by extracting and editing the files from the data folder. The icon, mana cost, and display in the spellbook during battle are changed. But it still can't be cast. (
Does anyone know what specifically needs to be changed for this to work? I would appreciate an answer.