if you read my original post you should be able to see, in parenthesis, the issue i want.
Viewing post in how to run a 128 issue
The problem is that you're in the general Itch forum. To ask a specific question about a project, you should do so at the bottom of that project's page.
Regarding C64, I imagine you're talking about a Commodore 64 project, but without context, and without knowing which game you're referring to, it's impossible for anyone here to even figure out what you're talking about.