Smart 3 - smart 4

I am new here, so I would like to say Hello to everybody :slight_smile:
I have also a question. I but licence for SS3 a couple month ago. Do it works on SS4 also? If not, can I downloaf SS3 somehow? And last, if I worked on PC and now I moved to Mac, do the licence works on Mac SS software?
Thank you for your replays.
Have a nice day,