Another way you can check it is to navigate to the game folder, and hover your mouse over the SH4.exe file until a little text box pops up on screen, and about the middle of that, it will display the version number. If you can't read it fast enough, just right-click the SH4.exe file, choose "Properties" on that context menu, and then click on the "Details" tab. About the middle will be a line "Product version 1.5.0.0" - or whatever version you happen to have.
