I have never seen such stupid installer before. No matter what path i choose always start to full my C disk. This
never happen before with the first and the second game. I try to move the temp directory to another location, nothing,
So i start to think the game don't use the temp folder when instaling the game but different folder and now i just cant
instal if because of that.I have only 15 gb on C and that is not enough.

It says right on the store page that the game requires "25 GB available space" as a minimum system requirement.

So 15 GB isn't enough.

You will probably have to free up the necessary amount of space in order for the game to install properly.

You might be able to bypass the GOG installer and do it manually using inno setup extractor. I had to do this for an expansion for a different game because the GOG installer wouldn't find the main game and wouldn't install.