[8FS_Bulau]

SO im trying to install U.I 1.1 and 1.2 and i already have mods in my Il2 folder. sooo so i uninstall to get a fresh copy? or what? please tell mee

Nope, just install over the top and overwrite all. Thats what I did.

should i delete the mods and Files folder?

No, don't delete the whole folders. Ideally, you want a clean U.I. 1.1, containing only the Mods that came with it, but it depends on what the mods are that you have added. If they involve editing .ini files, then you will likely have to redo that editing afterwards. Also some of the new mods may conflict with, or duplicate mods you have. If you can uninstall the additional mods that weren't in the vanilla 1.1, that would be a good idea.