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Tags - figured i'd just screencap. it doesn't elaborate at all in the way some do? (e.g. the ones that'll say 'made by a non-trusted developer/file is corrupted/etc)

Oh wow, that's a new one! It literally says "Can't open."

Send an email to, and I'll send you a steam key. I wonder if it's a Mac App permissions thing, and steam might actually work around it.