I am using Unity 3.5 in Windows 7 normally because I have active licences. Today I downloaded Unity 4 to explore some of the amazing features (like Mechanim, or DirectX11, etc).
But when I try to open Unity 4 then it wants to open and upgrade my other project (one I am working with 3.5).
Do you know how can I open Unity 4 using the new project popup window?