: Download the Unity Hub for Mac . This is the central management tool for all your Unity versions and projects.
: Go to the Unity Download Archive and find the "Unity 2018.x" tab. advertisement Unity 2018 for Mac Free Download
Unity maintains an extensive Download Archive where every version ever released is still available for free. To get Unity 2018 on your Mac: : Download the Unity Hub for Mac
: Click the green "Unity Hub" button next to your desired 2018 version (e.g., 2018.4 LTS for the most stable experience). advertisement Unity 2018 for Mac Free Download
Unity 2018 was a landmark release that introduced several core technologies still used today: Unity 101: How to Install Older Versions of Unity