I bought the license, downloaded the installer, and used it, but suddenly it notified me, saying, "Not all data will be saved in Demo Version," or something similar.
How do I connect my license to my computer and 3ds Max?
First, if you have installed Ornatrix using the MSI installer, uninstall from Windows the version you have currently installed (probably it says Demo in the list of installed apps).
Then on the Downloads page here make sure you get a build from the section titled "Ornatrix 3dsmax V8", not "Demo Version".