We just recompiled a version of the inventor for mojave and using the latest stable Qt.
It seems to work fine here, also works ok on high-sierra macs so we may use this mojave build host going forward. Could you please try it from here:
http://jevois.org/data/jevois-inventor-0.3.0m.dmg
and let us know if that works for you? We have not yet tried to make sure the colors are ok in dark mode but will look into that next.