Can you provide a bit more detail about what's happening? How does the game not work? Quits without starting? Black screen? Crashing?
Did you watch the video in the first post of this topic
? It's a guide to help ensure a smooth installation.
Without needing to reinstall the game, this might fix things: reinstall the Unofficial patch, then set the Tron game launcher (TRON.exe) to run with administrator privileges as shown in the video. Try running the game and see if it works.
If it does, try installing the mod again. If the mod won't install, look for this folder:
C:\Program Files\Buena Vista Interactive\Tron 2.0\Custom\Mods\Retail
. The mod will install now.
I created a troubleshooting guide you can read here
for more help, if you find you need it.