1. Sorry, much as we'd like to know that information, they don't tell us anything.
2. The update should occur automatically, eventually, but you can do that yourself by clicking the small arrow at the right of the green button and selecting "Get Latest Version". If that doesn't work then uninstall/reinstall.
We received your query enquiring about the update for SiteAdvisor from v.126.96.36.19953 to v.188.8.131.5261 . Thank you for contacting us.
This release does not contain the patch for FireFox 3 RC1 since this update is only for IE. We've fixed the FireFox issue and will be releasing (separately) the patch shortly. Thank you for being patient.