Plugin is missing - rtfx.zxp file in the RTFX generator packege

I contacted Envato a few months ago about a missing plugin in a suit I purchased:
Name of the packege: RTFX generator
missing plugin: rtfx.zxp file.

Envato recommends to posted the issue here.

Did anyone experienced the same problem and if so, how can I resolve it?

Thank you for your help!