

I have a released game in 3.5. It is not realistic for me to update it to 4.0.
I have to keep that code in 3.5, but if I want to start a new project in 4 I need to keep both versions on my pc. This is why the tool would be helpful. So I can easily switch between the 2 versions.
My (8-10 year old) daughter and I have played through and throughly enjoyed the first 4 in co-op mode.