I am experiencing this MD-0011-0 error with some of my plugins as well. It appears to happen to any plugin that I’ve resubmitted on Fab. However any that were migrated, without resubmitting a new version, install just fine.
This is obviously a really big problem and needs to be fixed immediately! Otherwise we’re going to start getting a lot of angry customers when they make a purchase and can’t actually download the plugin they paid for, or worse, request a refund and decide to go with some other plugin instead.