Thanks for your interest into PaintWeb.
Currently the code that integrates Paintweb into Moodle and TinyMCE is no
longer up-to-date. This means that updating the code to the latest
codebases of the two projects is not trivial, and cannot be done by a
user, it needs to be worked on by a developer.
I would very much like to help, but my time is used by work and the
studies I am attending.
Thank you for your understanding and sorry for this inconvenience.