Hello,
normally for Steinberg, a higher version licence automatically allows running a lower version product. However, for some technical reason, this rule does not hold for HALion 6. Therefore, after purchasing HALion 6 you will have to ask Steinberg separatelly for an additional HALion 5 licence because your original HALion 5 licence will get surrendered during the upgrade process.
So, you will need the HALion 6 licence as well as the HALion 5 licence and both these licences can be stored on the same USB key but then you will have to move it between those two computers. Alternatively, you can buy an additional USB key and move one of the licences to it.
–
Miloslav