I'd follow 3ds.guide but start from the beginning and use the single system transfer method in place of the two system transfer from there you should be able to follow the rest of the guide well, but make sure to follow the instructions exactly and check for yourself that everything is there. You should get the game first if you don't already have it. Might want to clear out the unneccesary files (if you send a pick of your sd card someone could help) so the files you used in your initial 3ds.guide doesn't botch your current installation attempt
I'm back, sorry. I believe there's a .exe script as well. Or alternatively, if your PC has a bad GPU, I could bruteforce it for you. My PC has a GTX 1060, so it should be relatively quick.