I had similar problems when looking for a 3D program.
Read the blurb about Viacad V8 and it looked good, filled the form in to get the demo which should have given you a link via email - no link.

Did it all again the following day and same happened.

Contacted Viacad direct and was told there is no demo for V8, the link doesn't work !

Sent back then why have a link on the page ? They repeated link doesn't go anywhere and he's a copy of V7 demo.

Wanted to try V8 as it had a lot of new stuff in but if this is how they treat a prospective customer it doesn't bode well. Didn't even bother downloading V7.