I just thought of this, but....THANK YOU, AUTODESK for making the upgrade free of charge!!

I for one un-installed v5.0 to install new update, but when I open the app it still shows the old version.  I am not even sure the if problem with HTML help file was resolved, because when I try to open the help file it never load up properly (for some reason it just tries openning many copies of the browser but none load the help file).  No PDF documentation either, nor is there proper instruction on how to install the update.  Fairly disappointed with Autodesk with this release of Sketchbook Pro.

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When you uninstall v.5.0 it might be worthwhile checking that your preferences folder is deleted too (or rename it) before installing v5.1. I don’t think this is always done automatically. In Windows 7 it’s here:
C:\Users\username\AppData\Roaming\Autodesk\SketchBook Pro\5.0