I have UPSmart v1.5 running on Win10 (10.0.18363).
I initially had an issue with the USB driver detecting the UPS which was an incompatibility from a previously installed 3rd party device. Removing that device and software allowed the UPS to be detected using the MegaUSB profile.
The main thing that appears to not work, is battery capacity, but is correct in voltages, load and frequency.