Workaround: disable networking while opening project. Global cross platform Unity Editor outage while opening project. Other known problems, but not related to OS upgrade: Xcode 9 works fine with macOS 10.12.6, so if you are in late development stages of your game, it's still recommended to stay on macOS 10.12. In general 5.4.x and older Unity versions might work with High Sierra on HFS+ disk, but it should be considered as last resort workaround if you have to use older Unity versions on new OS. There will be no Unity 5.4.x fixes for High Sierra, you have to either keep your machines on macOS 10.12 or upgrade your project to Unity 5.5.x and later. Patches for Unity Editor can be downloaded at usual place: Future Unity versions are expected to switch to it anyway. If you encounter more issues with Monodevelop on macOS 10.13 it's recommended to manually install Visual Studio for Mac and use it for script editing. These versions include multiple fixes for disappearing assets on APFS, Unity Editor and Monodevelop crashes. 5.5.5 patch 2 or later (install Visual Studio for Mac for script editing) MacOS 10.13 High Sierra upgrade recommendation: upgrade with careįor macOS 10.13 support you have to upgrade your Unity Editor to one of these versions:

Current macOS 10.13 High Sierra support summary:

Best games for mac os x high sierra