Hi, this is not related to SQL Prompt only, but to the update process in general.
As our company firewall is blocking the link in Help "Check for updates ...", I have to submit the "Download a 28 days trial" form and download the full "SQLToolbelt.exe".
Which is also blocked by the company proxy rules. :-(
So I have to download the file on my private PC and then copy it to my business machine.
I assume, my company is not the only one with such precautionary measures.
Maybe you can implement additional options to download updates.