where is solidrocks?

thanks

yes SR adjusts automatically the CPU number for all stuff.

default settings are good, but you can set OFF the "interpolate vraymats glossies if glossy is <= *preset value* if you don't like results or if you're making an animation.

interpolate vraylights can be set to off, too.
by default it interpolates only Vray PLANE lights, typically those you've putted on the openings to help interior lighting. if there are some irrmap splotches, just uncheck it.
All lights will be sampled, result is better but longuer.

i suggest the special DE mode, wich is, in my opinion, the best one in terms of suality/rendertimes.

oh yes you can.
the serial is computer based, and not max based.
So you'll get the same request/serial for any max version on the same PC.

you can get a second activation for same user on a second computer, for example your laptop.
Just like 3dsmax licence (2 activations for one signel licence - same user)