While searching for ROMs is common, it’s important to remember that downloading NSPs for games you don’t own is a breach of copyright. The best way to support the developers at The Gentlebros—and ensure your Switch stays safe from bans—is to grab the game during a Nintendo eShop sale, where it’s frequently discounted to a very low price.
When sourcing your files, ensure you have the “Base NSP” and the “UPD v1.1.1.” Install the base first, then the update via your favorite installer (Tinfoil, DBI, or Goldleaf). cat quest ii rom nsp update switch game top