I first downloaded and installed Vectorworks 2019 to my iMac Pro running High Sierra. Tried to use it with various files with several issues so went back to 2018 and will wait for the first update. Then, not learning my lesson, I downloaded and installed Mojave. Both 2018 and 2019 had major performance and display issues. So, I went back to High Sierra, a major process, and will now check here before updating either again!