unable to check for updates

[tim61]

I'm running 4.3.10 on Windows Server 2012...

when I hit the 'Check for Updates' link (Help menu)... it gives me a useless error with no indication as to what I can do to solve the problem:

The network operation failed with the following error: Unknown reason

I can get to virtualbox web site with FireFox, so I know the host box has connectivity... I poked around for logs and came up empty (I'm a newbie when it comes to VirtualBox, so it's entirely possible that logs exist somewhere I'm not looking)...

so... what am I missing? should I just manually install 4.3.12 on top of my current installation?

my main motivation is to get the extension pack installed - I've just downloaded the 4.3.12 version... I suppose I'll see if it will install on 4.3.10 - or try to find a download for the 4.3.10 extensions - any thoughts?