The release of The Definitive Edition does exactly what scene releases have done for decades: it removes barriers. It kills online checks, unlocks paywalled content, and backs up a game that might one day be delisted entirely (like many Marvel licensed titles).
If you choose to download it, do so with the knowledge that you are playing a museum piece—a monument to what happens when corporate live-service mandates clash with artistic ambition. For the rest of us, we can finally enjoy smashing Taskmaster as the Hulk without a "Reconnecting to Square Enix servers..." popup.
Fix: The crack attempts to write saves to a read-only folder. Run the Avengers.exe as Administrator, or manually grant full control to Documents\Marvel's Avengers .
Fix: Navigate to %LocalAppData%\Avengers\Saved\Config\WindowsNoEditor and delete GameUserSettings.ini . Let the game regenerate it.