But this is a new skin - he's not replacing the skin that he's currently running with a new version. Basically, he's just installing a brand new skin. So there is no reason why he shouldn't be able to boot Primo into his existing skin?

I suspect it might be because he replaced his sys.txt with the version that is included in the skin archive (which includes the skin itself as well as other files). It also includes the save folder which you wouldn't want to use since it's a save folder from the new skin, which he isn't running yet.

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