Not sure if this has been covered elsewhere, but I've found that every time I install I get an error that the update failed (windows 10, administrator account). A little digging found that the "Publisher Public Beta" folder in Program Files is locked. The folder appears to be empty and read only according to properties, although I can't open it or change it's properties so I'm not sure how reliable that is. I've found I can install the new beta just by running the installer again and picking a new folder destination, then it works fine. This is the second time that this has happened (I've attempted to update twice since my initial download) - strangely enough, the FIRST folder that was locked has since been removed, but now my second folder is locked (I'm now on "Publisher Public Beta 3").
So I'm wondering, is your uninstaller doing something weird with the permissions on the folder during the uninstall process?