Don't think I've seen this before. Don't even think the author has things for sale from what I can tell. Couldn't find an obvious option on any of my models to toggle this either.
Anyone know what's going on?
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Had this happen as well with the GR86 trunk handle file that's on there as well. I made a make, tried to mark it as such, but was given the same error. Like with your case, the creator doesn't have an option for purchase/support.