
Though I still don't know why.
So that's what I have done:
1.I've installed my czech version of BGII - it differs from english in two things - first is that it already has ToB with patch 2.5.26498 installed and the second is that it has czech dialog.tlk (but that doesn't matter because I replace it with a new one).
2.Then I've replaced my ToB version of BGMain.exe with the one from SoA english patch.
3.I've emptied the override folder (don't works without this step)
4.And then I've exactly followed the instructions
I haven't got far yet but the mod seems to work.