Everyone, just a PSA that Visustella has an official outlet for support. Please contact them here, as you'll get a much faster response that way: http://www.yanfly.moe/wiki/Troubleshooting_Plugins_(RPG_Maker_MZ) There's a report option that goes straight to the devs if needed. Posting support issues on the forums is just risking your issue being missed by the support team.
Hypothetically, if one were to discover a method via which it's possible to acquire several of Yanfly's paid plugins without paying for them in a technically legitimate fashion, one really should inform him of this, right?
It's still early days, and I was going to keep this under wraps until development is a bit further along, but I'm just so damn proud of how robust the integrity-checking in this plugin is that I have to share it.