[GNC] How to upgrade from 3.8 to 4.1 on Win10?

[Fran_3]

Just now getting around to upgrading 3.4 to 4.1 on Win10.
1 - I've downloaded 4.1. Do I just run it or first uninstall 3.8?
2 - Also I see in the archives someone tried to upgrade from ver 2.x to ver 4... 
and the following comment (amoung others)...
" Skipping versions (such as2.5 ---> 4.0 is not supported"
Does this apply to going from 3.8 to 4.1?
3 - any other steps that should be performed to have things go smoothly?
I'm sure this is somewhere online or in the archives or Wiki but, after digging around for awhile, I just haven't stumbled across it so thanks in advance for any help.