Hey macOS Unity users, if you're running into issues with the Unity Installer while trying out the version of macOS that Apple announced at WWDC today, you can fix the error by updating your version of Unity with the instructions below: All versions of Unity available via the Unity Hub can be installed without issue. If you need the Download Assistant for offline installation, you can update via fixed versions of the installers. An updated 2017 installer can be found here, and an updated 2018 installer will be available later this week with the release of 2018.4.2. Previous versions of the installer will not be compatible with macOS Catalina. We're working to resolve the error and we’ll let you know here when everything is updated. Let us know if you’re having any issues in the meantime.