I've read a review that you get basic version with the Special Edition. Is it true? Because I don't need the Special Edition, just the vanilla with expansions.

If you mean the 'Legendary Edition', then no. See here;

https://www.gog.com/forum/general/release_the_elder_scrolls_v_skyrim_79ad7/post52

The original Skyrim (vanilla) is not available on GOG.
Only the "remastered" Special Edition and the Anniversary Edition, sadly.

I would have love to own the original edition on GOG too.

It's still available on Steam.
The game is not listed anymore (as requested by Bethesda)

https://store.steampowered.com/app/72850/The_Elder_Scrolls_V_Skyrim/

Ah, I see. I thought it was pulled completely.

People who owned original can still play it, it's just "officially" unavailable.
But you can still buy cd key from whatever retailer...
Sadly we're limited to steam platform in that case :(

Game being broken is a common thing
Just lemme choose which broken piece :p

No need to call GoG name
There no world where Bethesda will show, how broken their game got the further they work on :D

Acrtually this is not quite true. You can still buy it even on steam. The game just does not appear in the search but you can easly find the working link from the steamdb site for example. The game has price and everything