Every link seems to go to the Czech versoin of Divinity Original Sin.
I have tried multiple languages and I've tried downloading both with the GOG downloader links and the website/GOG Galaxy links.

same problem fo me PLEASE HELP

Contact GOG support; the links must have been accidentally changed when the Czech version was added.

Hello,

The guy form the french support told me that in order to get the right language, english language must be selected first and only after that, the desired language ! Note that the name of the downloaded files could indicate the language of the game normally.

Have not tested yet but you can try ^^

Edit ; sorry have not seen that a member of gog had replied^^