Hello Martin,
the Demo license is valid for 30 days after its activation. Function-wise, there's no restriction whatsoever. You will have only one Main Microphone position of one single MIR Venue at your disposal, though (... that's not us being greedy, but to keep download traffic at a reasonable level 8-) ... we're talking about gigabytes of data here.)
Actually, the number of application starts is limited too, but that's just an additional security measure. If you run out of starts within 30 days, you can easily "re-fill" your demo-license online, using the eLicenser control panel.
HTH,
/Dietz - Vienna Symphonic Library