Umm… pirating windows is your recomended solution?
Look don’t get me wrong I could say it’s if anything more cost effective for simply the dev’s to say “OK anyone who has more than 1 hour of linux play time prior to this date qualifies for a refund”.
Of which, most likely is a handful of people so easy work.
Screw privacy sensitivity that’s a moot point. Installing windows isn’t a minor tweak to a computer .First of all the suggested method is technically breaking the law. Secondly you are talking minimum adding in a windows partition, so an extra 50 GB storage on top of the amount the game takes. Comprimizes to the boot loader on the system, in which there’s a high chance of messing up an existing install.
IMO set him up with some of the modern engines and tutorials… Godot 4, Unreal etc…
actually if you are looking for some stuff to have ready for him.
https://www.humblebundle.com/books/game-programming-with-c-unreal-packt-books?hmb_source=&hmb_medium=product_tile&hmb_campaign=mosaic_section_1_layout_index_2_layout_type_threes_tile_index_1_c_gameprogrammingwithcunrealpackt_bookbundle
If he has access to youtube there’s also lots of really good tutorials etc… out there. Heartbeast has some awesome ones for godot etc…