Yes, you can copy the Maelstrom.exe, modules, fmod.dll, config.exe into the same folder as GOF 2.5 and try that. If the game works after you copy, but you cannot launch from Itch client, then we just need to correct your shortcut path to match where you installed. Let me know if you can get the game working with a copy. If it does, you will want to fix your shortcut so you can always get the automatic updates. If you copy the Maelstrom.exe into the GOF 2.5 folder, that one will not get updated automatically.