A tool called (by ManlyMarco) analyzes a character card and tells you exactly which zipmods are required before you even load the card. Run the card through the .exe, and it prints a shopping list.

Solving the "Missing Zipmod" Headache in Honey Select 2 If you have ever loaded a character card in Honey Select 2

: If a specific card is causing the issue, loading it in Character Maker and re-saving it can sometimes resolve internal Sideloader errors.