You can also move the speed.exe from the first installed game, doesn't matter which, to a temp folder then install the second game. Afterwards, put the moved exe file back to it's original location.
Both game exe's are named "speed.exe" Create a temp folder in the root of the game which is already installed then move the speed.exe file to this new folder, then install the new game. After installation, move the speed.exe back to its original location then make sure that in the properti...