(PC) is a notoriously persistent issue, often caused by the transition from the old Origin client to the EA App, or by using Steam-bought versions that fail to communicate with EA’s servers. The game incorrectly believes the downloaded DLC has been modified or isn't owned by your account.
Corrupted local license data often blocks the authorization check. mass effect 2 unable to authorize dlc
If you have a legitimate copy:
If you are still unable to authorize the DLC, try these workarounds: Binkw32 Proxy DLL Fix: (PC) is a notoriously persistent issue, often caused