Nuendo 4 and 5

I can’t seem to find the info on having 4.3 which I currently use and 5.5, which I will upgrade to, on the same machine. I want to be sure to have both incase some older session don’t open properly.

So the question is, will 4.3 remain unaffected, or will it be upgraded when I install version 5.

You are safe to install both versions, even in 32 and 64 bit on the same machine.
On a secondary PC I have 6 versions co-existing and fully functional on one drive w/o any problems.

Big K