Steve (skorman) -- When you say that after installing the patch the sim will not start up, exactly what is happening when it fails to start? Do you get any error messages? Do you see any console windows? As indicated above, we have not seem any other problems with the .4 patch, and we'd like to help you get this patch installed on your PC, but to do so, we'll need more info on what might be causing you problems. Other questions include things like: What was the last aircraft you flew in the sim? Are you using the TacCon controller or a transmitter?

The reason I ask these questions is because if your options.txt file, located in the Options folder, got corrupted somehow, it could be preventing your sim from running.

If you'd like to try going through this to get .4 to work for you, we can give it a try. But first, make a backup copy of your FS_One.exe in some backup location. That way, you could always copy the backup version exe over the .4 exe, if needed, and avoid having to re-install the entire sim from CDs.