I assume this because when I try and install it (as a non-owner on XP) I get to 99% installed and then the process stalls.
It's very hard to kill the process too.
Actually I seem to remember exactly the same thing happening when I tried to install your previous version (4.63) to try that out too.
I've been trying to try this software for around 4 years now, and failing badly. People tell me it's great software, I'd love to find that out for myself!
So, is there a demo, or is it just me?