I got version 2.6.0.0 working by just uninstalling v2.5.1.0.:
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Previously tried to update to 2.6 from the Dashboard and got the error message
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Uninstalled v2.5.1.0 and was immediately offered to install v2.6.0 in the uninstaller final message box
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Allowed v.2.6.0 to install from the uninstaller
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Happiness
I did use Ashampoo Uninstaller but I assume it will work with normal Windows uninstaller because all I did was run the program’s own installer .exe