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VSTO: The customization cannot be installed because another version is currently installed...

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This issue may be caused if you have built the add-in in debug on your machine and it is also installed from the deploy location.

  1. Open “COM Add-ins” form by either
  • Go to the Developer ribbon and click on the “COM Add-ins” button

Or 

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

  1. Select the Add-in name and click the button “Remove”
  2. Then you’ll need to uninstall the Add-in from "Programs and Features"