I currently own AmpliTube 4 Total Studio MAX 2.
In My product page I also have AmpliTube 5 SE showing with a serial number and registered date.
I haven't downloaded 5 as I don't know if this is an automatic upgrade and if 5SE version is better with more features than 4 Total Studio Max 2.
I have always found IK products not being clear with their explanations.