When I cleared out the junk from my C: drive, I found a giant Microgaming cache folder, I think in Documents and Settings\All Users\Application Data, that's where the stuff might be stored.
The big problem is they do all this in secret, so users have no idea what "improvements" have been made. This also means that if they have trouble, for example - they have set their system to block access to their personal documents folder, they will have no idea where to start looking for the solution, and casino CS will be utterly clueless and will keep telling you to uninstall, reinstall, switch off firewalls and anti-virus applications, none of which will work.
I have noticed this cache folder too, but stored with the casino installation in program files.
I have also noticed that this month ALL my MG casinos offer an option to either install the update or simply proceed to the lobby to play. Unfortunately, NOTHING actually works UNTIL you accept the update, I even tried REALLY old games, and I could not even load "Double Magic" 3 reel slot without accepting the November 2007 new games update.
As far as I am concerned, MG have gone through the motions but have produced nothing.