hi,
I have purchased a new mk3+ from a friend that had never opened the box.
I already have the mk3 along with software my question is can the software that I already own be used with the mk3+?
thank you
Yes, no problem to use SW, that you use with MK3 (or any other controller/keyboard), with new M+ (or any other controller/keyboard).
You cannot sell unused SW that came bundled with second, third, ... controller/keyboard.