You downloaded the .jar file of the Lotus Notes Add-in, but you are getting the message "No acceptable features were found on the selected site(s). Choose a different site or site category." when trying to install it.
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There's already a previously installed version of the add-in.
Uninstall the previous version of the addin and install the latest version.
Lotus Notes; Add-In; Add-On; Groupware; Installation; , KBA , LOD-CRM-GW-LN , Lotus Notes , How To