I keep getting the message: "cannot find add-on"

Two months ago I installed (unsuccesfully) the PS add-on "MyColorPicker". Every time I start up the computer I get this message from Adobe Creative Cloud Desktop App. In the Desktop App is shown that I "updated" the Add-on some days ago, but opening the Adobe Add-ons page I see the message: "cannot find the required product".
I don't know what caused this behavior: the add-on seems to have been removed from the Extension Manager CC page.
I see no way to remove the MyColorPicker entry in the Desktop App in order to get rid of the messages. How should that be done?
Regards, Sander

Review this first to make sure it was done correctly
Uninstall Silverlight: https://www.microsoft.com/getsilverlight/get-started/install/removing-silverligh t-mac.aspx
Next run through the list of fixes here, perhaps it's something else
Step by Step to fix your Mac

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I keep getting the message: "cannot find add-on"

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