I used the Autodesk Inventor Publisher Labs preview and wanted to have a go with the "Trial version" to see what's changed. I have input my details 3 different ways (using IE8, Chrome, and IETab on Chrome) none of which results in a download starting.
I think the issue is to do with the Akamai installer file you are prompted to download and install - I guess this program doesn't like working behind Proxies? If so I will have to try and grab the files at home - as the non-download manager route doesn't seem to be available to me.
Also, although I am UK-based, my internet traffic is routed via Spain, and the Labs Preview was unavailable at this location too. Is this still the case? If so, please can the site be updated to reflect this problem.