The customization cannot be installed because another version is currently installed...."

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Anthony edited this page Jun 26, 2017 · 9 revisions

It means you have built the addin in debug on your machine and it is also installed from the deploy location.
Open “COM Add-ins” form by either

Going to the Developer ribbon and click on the “COM Add-ins” button

Or going to the "File" ribbon and click on the "Options" button. Then under “Add-Ins” select “COM Add-ins” and click “Go…”

Select “Excel Addin Script Help” and click the button “Remove”

Then you’ll need to uninstall and reinstall the Addin from "Programs and Features"