: The Unity 2018.4 User Manual is the definitive technical guide.
If you are looking for documentation or guides ("helpful paper") to get started with this specific version: 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. : The Unity 2018
versions like 2018.4.x are recommended for stability. Find your specific version and click the macOS dropdown. Unity 2018 for Mac Free Download