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I give up.

When Enchanced Edition being released I've try download from official site patch.11 GB in 300MB parts, sounds good because my 2Mb DSL download this faster (300MB in ~17-25minutes) but no, half of the parts was corrupted and don't say which. Replacing part 0,1 and 2 don't help.

About week ago I've unlocked my retail key copy on GOG. 14,99 GB on 2MB - it was almost one week of download.
Now integrity checking say five parts from 8 are corrupted.

I've tried install my retail copy but guess what? First DVD have CRC error... But that was reason to add my retail key to GOG profile!