So, just to clarify, Unfinished Business for BG1 works with BGT (that meaning it works with BG2 engine) , and i have to install it after BGT. I can't install the two mods i mentioned after BGT because they have been made for BG1 engine and even if i install those two mods before BGT they will not carry over BGT instalation because again they have been made for BG1 engine.
Yes, and yes.
You can't apply any mods to the original saga (BG1), It needs to be a fresh, untouched installation when using BGT .
The only mods you can install in BG2 before BGT, is the BG2Fixpack, and TOBex. (If you want to use that.)
The BG2Fixpack can be installed before BGT, or directly after it. It makes no difference.
TOBex (If you are using it) needs to be installed first, on a clean install of BG2, before BGT.
The other thing, the widescreen mod at number 11 in the OT, should be installed last.
If you choose a resolution for the widescreen mod, and then want to change it (because the text is too small or something)
You MUST start a new game. If you change the resolution after you have saved your game at a different resolution, your game will become unplayable when you re-enter a previously visited location.
Finally the bugs that should be fixed with Baldur's Gate Fixpack only exists on BG1 engine right (that makes sense)?