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I've just installed the Keep on a brand new PC, switched to the Beta update stream in order to get the update, but it's still telling me there are no updates available.
That beta version is kind of a "must have" due to the built-in PDF reader. If you've ended support for The Keep (which would be entirely understandable given the age of the app) is there any chance you could make it available as a downloadable file rather than an online update?