Uber Schwarz

I have the GoG.com versions of the Baldur's Gate series installed and I want to install the following mods:

• Unfinished Business BG1
  
• Unfinished Business BG2
  
• BGT
  
• World Map
  
• BG2 fix pack
  
• Widescreen
  
• Big Picture or just the Ascension(not sure which?)

Which order do I install these mods? Should I install Big Picture or just the Ascension mod? The Big Picture mod has Ascension with it but I wasn't sure which one is more up to date.

This is the message I get when running the .bat installer:

"The minimum requirements are not met.
The listed mods are not present in your BGII - SoA Directory.

BG2 Fixpack
Baldur's Gate Trilogy
TxtMusic

The listed mods are mandatory.
Please copy them into your BGII - SoA directory and then continue."

I'm trying to install this on the GOG versions of Baldur's Gate I & II on a 64bit Windows 7 desktop. I have previously installed BWP on a 32bit Windows Vista laptop with the 4 in 1 compilation of Baldur's Gate and it worked without problems. Why is it that it didn't require these mods before but it does now? How exactly do I get this to work?