If you are looking for documentation or guides ("helpful paper") to get started with this specific version:
To download a legacy version like for Mac, you should use the official Unity Download Archive , which hosts all previous versions for free. ⬇️ Download & Installation Steps Visit the Archive : Go to the Unity Download Archive . Unity 2018 for Mac Free Download
: Unity 2018 generally requires Mac OS X 10.9 or higher. If you are on a very old system like El Capitan (10.11) , stick to version 2018.4.26f1 for the best results. If you are looking for documentation or guides