Adobe Updater not working for CS4

I have installed CS4 Master Collection on a new Windows 7 PC and it is working, but Adobe Updater isn't working properly. It first installed a few updates that were correct, but now it can't find the remaining updates (which I know exist).

The message is "Please note that some updates for the following products cannot be determined at this time," and then it lists most of the products.

I know that CS4 isn't supported any more, but I would have expected Adobe Updater to at least apply the remaining available patches.

I found another thread where it suggested the updates shown depend on the system clock. (http://forums.adobe.com/thread/913379). I set it to earlier and it briefly found the updates, but it seems to cause Adobe Updater to become unstable, so that hasn't worked for me. There was a suggestion that the Adobe certificate may be out of date (thus the System Clock fix works for some), perhaps Adobe needs to update its certificates?

How can I get Adobe Updater to apply remaining patches? Thanks.