The current version can be located on the Garritan site as Karl stated. Information (in the form of discussions, questions, and answers) can be found by doing a search as I suggested. The next update is being tested now and will be released at the conclusion of testing (no, we haven’t determined when that will be).
I'm more than a little bit confused (but was perhaps born that way!). If all I am using is GPO as a VST is there anything from all of those updates that I need? I am aware of the Kontakt update(s) [separate matter] but presented with that long list of things on the Garritan.com update page, I think I read through the list and come up with a net ZERO of things I need to use GPO as a VST (in Cubase SX 2).
If you mean the list of things concerning user-supplied utility plugins, changes to ancillary programs like Overture and Studio, etc., then you will need to evaluate if any of these apply to the way you work. If not, then you can safely ignore them. Since it appears that you use the VST version exclusively that may be the case. Just make sure you are using the latest version of the player/library.
P.S. Some of the clever utility programs (like the key peddler) are very nice and can certainly be used with the VST version of GPO in CubaseSX.