We've updated our review with details about Windows 8.1 Update 1, and some hands on impressions with the refreshed operating system. Jump straight to Page 8 to check out the updates.Windows 8.1 has now been out for a few months and is a freely downloadable update. Microsoft has already released what is the equivalent of a first Service Pack for it, Windows 8.1 Update 1.The latter should already have landed automatically on Windows 8 systems via Windows Update; you need to have Windows 8.1 already installed beforehand.