An MRZIP file is a report template package file. You can place an MRZIP file into your template folder <user folder>/AppData/Local/.magicdraw/18.4/data/reports, and MagicDraw will automatically deploy the template into the Report Wizard dialog.
The following three figures show you how Report Wizard can automatically deploy an MRZIP file.
Copying the MRZIP file into a template folder
Automatic deployment of the MRZIP file
Report Template installed in the Report Wizard dialog