Have you checked " Program Files\Epic Games "
Yes. It's right there, the first thing I said: "but when I go to the Epic Games folder, there's nothing there related to M&B Bannerlord"
and then the last thing I said: " Now I just went to the folder where the Epic Games launcher is located and still, there's nothing there." (which brought me to a different folder initially, then right click > show path > back to the initial folder)
and there was also: " Tried to search for "bannerlord" and other related key words and it never loads anything, maybe because my computer is pretty old, so it might be a bit slow, but I still can't find the Bannerlord folder. Tried searching everywhere manually, still no success" - which is to be read as "I checked every single folder inside the Epic Games folder and then searched for everything else in program files and x86 just to see if there was something else with a more subtle name".
please don't be lazy, I listed everything I've done, just read it.
