I am trying to install an older version of Unity. I had version 4.6.9 on an older system running Windows 7 Professional 64bit Service pack 1 and had no problems. I now have a much faster system running the same OS. I have tried downloading the Unity version and installing and also tried installing directly from the site. I get an error that Windows can not open this file type. What is going on?
Need the older version for a Udemy Unity course I was taking.
No, they are not broken. It’s broken on your side. You can even install unity 2.5.1 and use for 30 days without trouble.
I have no idea why the newer version of unity would not work for the course. The only difference you will get is prettier graphics and better performance. Some scripting has changed, but unity will automatically convert it for you.
The only serious problems you will have are: car physics from 4.x, custom shaders, mesh Get/Set TriangleStrip functions. Just use Triangles instead of TriangleStrip.
After all you will still have to upgrade to unity 5 at some point.