When installing Legacy SharePoint connector for Confluence in the SharePoint server, you get this error message:
The issue happened because the installer was not deployed at SharePoint farm.
You'll need to log in to a SharePoint server in your farm as a SharePoint farm administrator and install the connector at the farm level. Make sure to run the installer as administrator. Refer to this documentation (or the respective documentation for the add-on version you are using) for the details: Installing and Configuring the SharePoint Feature on SP 2013 (v 1.9).
The documentation above is specific for SP 2013, if you're on a different version, you can select the right documentation (or the respective documentation for the add-on version you are using) from here: Installing the Legacy SharePoint Connector (v 1.9)
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