Introducing MSP360™ Remote Assistant for macOS
That is correct, the key can be generated only on Windows hosts yet, current version only supports remote control of the Windows hosts. We are implementing the features step-by-step to be sure that those features are polished and working correctly. Cross-platform connections are really complicated and we are playing it safe. The ability to control macOS operated machines is going to be released a bit later this year. Thank you and let us know if you have any other questions.
I think there is a bit of misunderstanding, the software can perfectly control the remote Windows operated hosts. The reason why we release the feature set step-by-step I have described in the answer above.
There are no plans currently to support the older versions of macOS due to key changes made by Apple themselves, unfortunately.