If, when trying to install a hacked game, N-Gage writes that the file is corrupted and prompts you to delete it, then the installserver patch is not active (on S60v3.2 (Symbian 9.3) and higher) or installserver.exe is missing on S60v3.0-S60v3. 1 (Symbian 9.1 and 9.2).

Installserver.exe S60v3 WORK