Check for Update and proxies - UK version

I am still using v.2 (3188) and I am aware that there is an update to this build (I think). The problem is that our proxy doesn't seem to communicate with Parallels servers (it's the same everytime I check for updates). Does Parallels use proxy settings from the OS to download? What port does it use to do so?

I can't download it from Parallels website as I one of the unfortunate who are locked in the "non-US English" version from Avanquest. Requests for a download location from Avanquest remain non-answered. Are there any mirror sites where I could download the latest UK update? Anyone else experienced this?