I was able to get the ModInstaller working for 911 First Responders based on M1 Tanker's instructions. Just a couple points to add: - Edit your Windows Registry at your own risk. Messing with things in there can cause major issues if you don't know what you are doing. - You can install the game anywhere you like - Just make sure that when you add the Installdir registry entry, it references the game folder at it's actual installed location. - The default install folder for the Atari version (download from Amazon) is C:\Program Files\WizardWorks\911 - First Responders (32 bit OS) or C:\Program Files (x86)\WizardWorks\911 - First Responders (64 bit OS). - Make sure the Installdir property references the actual installed location (I.E. C:\Program Files\WizardWorks\911 -First Responders) - Be sure to add the registry entry to both HKEY_LOCAL_MACHINE and HKEY_CURRENT_USER Keys. - The ModInstaller (ModInstaller.exe) is located in the folder the game is installed in. For the Los Angeles Mod, it will initially throw an error that it can't find the install location. This is okay; click continue and you will be able to specify the install location later in the installer. You do not need to use the ModInstaller to install it. The LA Mod will be listed as an installed mod in ModInstaller after it is installed. For the NYC mod, run the ModInstaller, Click install Package, and browse to the .mod file. Click Ok and it will install. If you get an error that the package is corrupt, go back and verify that the Installdir registry key exisit under HKLM and HKCU and that it references your game folder. Hope this helps those of you still having trouble. Enjoy!