LordOfBikes wrote

Wait, don't uninstall!

The error message is because you installed 2.2.0 without uninstalling 2.2.1.
This is basically no issue, but the plugin pointstocsv was added with 2.2.1 and built with a newer Qt version than 2.2.0.
It is still in the plugins folder, but not compatible with 2.2.0.
So just delete C:\Program Files\LibreCAD\resources\plugins\pointstocsv1.dll and the message disappear.

Armin