I've translated all it says in the box in the message above.
"It says: Error while oppening a file to save
cancel to cancel installation, try againn to try again (nothing happens when I do) or skip to skip saving this file"
Yes, I have tried to save it elsewhere (even just now) with no luck. And no, there is no antivirus in the background.
Did I perform the actions above correctly?
preferglsl = false
postproc = false