Hello. I have problems installing the program on my MAC. I chose the FREE version: For beginners Personal. After installation, the program tells me that I don't have an active license. How is it possible? I have 10.10.5 Mac release. Thanks
The license is free for "Personal" licenses. You basically create and log into an account with Unity. OSX 10.12 is the current minimum requirement though, so you probably have to go back a ways for 10.10.x support. https://unity3d.com/unity/system-requirements
iOS 10.10 doesn't exist. If you're talking about Mac OS 10.10, I don't believe Unity maintains a list of system requirements for each version of Unity. You'll probably have to do some detective work going through the release notes of all major versions over the last few years, since system requirements changes are included in the release notes. What I'd really recommend though is to upgrade your computer. If you're using a really old computer which can't run a recent version of MacOS then you're very likely to have a horrible experience using Unity anyways.