New computer x6 install

[Paul in Ottawa]

I apologize if this has been covered before but it really confuses me with the single license procedure.

Just bought a new laptop...a clean slate. Can I just install the x6 upgrade or do I need to install x5 first??

Any issues with installing x5 again on a new machine with old machine still having the software??

I've been a user since version 10 and have just upgraded along each time a new release comes along.

If I have it correct, I need to deactivate x15 on the old, install both x5 and x6 on the new???

Thanks very much