: Download the Unity Hub for Mac . This is the central management tool for all your Unity versions and projects.
: Unity Hub will open and ask which modules you need, such as Mac Build Support , iOS Build Support , or Android Build Support . Key Features of Unity 2018
Downloading older software like requires caution. While "free download" advertisements often lead to third-party sites, the safest and most reliable way to obtain this specific version is through official Unity Technologies channels. The Official Way: Unity Download Archive
: Go to the Unity Download Archive and find the "Unity 2018.x" tab.
: Click the green "Unity Hub" button next to your desired 2018 version (e.g., 2018.4 LTS for the most stable experience).