A really appreciate yours and your friend's great sense of humour but the problem remains the same:
My result of latest installation:
Map seems to be ok but for example fireball animation seems to remain just as in original BG1. what do you advice me to do?
A friend of mine would suggest, to kick your PC (really hard), maybe you sould try it, if you break anything and it doesn't boot then you won't have to worry about BWP any more, you may call it a solution to your problem
I am becoming really a guru of reinstalling BWP, my computer is busy with this task for more than a week alreadyBut with latest fixes in BWP, in standart installation, fireball animation(don't know about other spells, only fireball and delayed fireball) seems to be oldschool like in BG1. Here is my BiG World debug.txt:
[attachment=19905:BiG World Debug.rar]
I am really a really a fan of BG1, so it's ok if only fireball will be with old-style visualization, but maybe it's a sign of a more serious problems?
I don't know if it's going to help or not, but you can delete baldur's gate 1&2 from control panel -> add/remove programs and then delete the folders from program files or wherever you installed them. Then you can make a clean Installation (no extracted files placed at BG directory, let BWP extract them) and follow the steps I followed, it worked for me, I did it twice, it could work for you as well. Here's what I did:

I know, it's a pain in the ass reinstalling BWP but it could work.
NOTE: I chose not to install any foreign language mods, I also chose tactics version (1st time) and Standard version (2nd time), not custom installation or any other kind of installation.