You don't need to install it, just unzip it and place the files into a folder called FS Screen (For Example). Then everytime you want to take some shots, double-click on the exe file, a little window should pop up in the Taskbar. Start up the sim, then when your ready press the Print Screen key on your keyboard
The screenshots will collect in the same folder as the exe file
Regards, Stratobat
'If the literal sense makes good sense, seek no other sense lest you come up with nonsense'