How to Update Redmine on Windows (Helicon Zoo)

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http://serverfault.com – Quite some time ago I installed Redmine 2.1.2.stable using Helicon Zoo feed. And it's been working great (minus multi-minute app pool warm up times). What's the best way to upgrade to the latest version? The feed was last updated 2013-01-29 and is on 2.2.2, but I can't find any facility in the WebPI for upgrades. Using SQLlite for storage, if it matters. Thanks! (HowTos)