The installer displays this information after the installation has been finished:
>To play the Unofficial Patched version of the game RUN THE GAME FROM THE SHORTCUTS THE PATCH CREATED!
>If you want to play directly from the Steam client ADD -game Unofficial_Patch TO IT'S LAUNCH OPTIONS!
>After switching from the original game to basic or plus versions YOU ALWAYS NEED TO START A NEW GAME!
>If you are RUNNING IN A WINE environment start the game using the script in Patch_Extras/Player Mods!
>In case you experience INCREASED NUMBERS OF RANDOM BUGS, save, exit the game, restart it, and reload.