You just need to obtain a prod.keys file, better get one up to date so that it cointains keys up to you most recent games,
put the file in the folder where you run the app, then in the app on the menu click "File" and select either a file or a...
I may try the new ram site, and download more RAM to my Switch. Not sure if ddr3 is the right ram
for it tho. Edit- no it uses floppy Ram, just like @AncientBoi