[Unity Installer] Installer can't install unity3d on Disk

So I ran into this issue the recently in which Unity install couldn't be installed on my computers drive because the contents on said drive, couldn't be changed. Just to start this off I will tell you I was using an IMAC that is fairly new and is fully updated.

So I looked up some solutions for this and tried some of the methods others have tried, but none of them seemed to work. I got frustrated, but with help of a download link for Unity Hub, I downloaded the Hub first( which you should do anyway, without the Hub most people run into issues).So just to clarify the solution to this issue is first getting the Unity hub. Now for me it was a pretty interesting case because I was trying to get an older version of Unity and when I clicked on the green Unity Hub button nothing would happen, no download, so I used this and installed it first - https://unity3d.com/get-unity/download . Then, once downloaded, I went to the Hub, opened it and activated my license. Once the license was active, I went into the installs tab in the Hub, you'll see it on the left hand side, from there it will prompt you to download the most recent version with about 2-3 other options. At this point I didn't care about getting the older version any more, I just wanted to get the program to run and prove to myself that I could troubleshoot it lol. So I clicked on the newest version as it prompted, install took a little while and I was promoted one or two times to enter in passwords and allow things to run blah blah blah, but all in all, it worked. So I wanted to put this in here, just in case someone else was going through this, I know it's annoying, but at least for me this solution did work. Hope this helps! -236