From nerolinux's site I couldn't understand how long a serial is valid. Since its price it's ok (20eur), I was wondering how long this serial lives and works. Is it a serial for only a release?
Not at all! It is working like under Windows: If you buy a serial for NeroLINUX now, it will work with all version 2 updates (2.x.x.x).
And I bet that the 2.0....series will be around for a while...considering that we are only at 188.8.131.52 now!