I need to use Unity 4.1.5, but I am unable to open it on Mac machines and Windows VMs (Windows 10). In fact, version 4 does not work. On Windows, it crashes at the splash screen with the exception code c0000005. On MacOS, the application launches, but it hangs infinitely, and I am forced to quit it. I was able to activate both Windows and Mac versions successfully, but launching it with or without a project results in a crash. Any advice is greatly appreciated!
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