Wow. No reply.
Exact same thing for me. I've tried downloading further demos using Firefox, Opera and a few minutes ago, Safari, all on the PC. The Moog one last month, is the last one that I've been able to download.
The same thing has happened using Safari on my new Mac.
I'm 'on the fence' at the moment whether to purchase the ARP2600 V one or the Moog Modular V one but ... if this problem continues and I can't HAVE what I pay for ... ?
(Currently, I'm a Spark owner.)