You should also check at (link on xAct page provided) for possible contributing packages updates since the main xAct package was created, such as a whole new xPrint version and updates to xTras. Follow the Invar link on the xAct page, and on the Invar page there is a Readme link that provides detailed instructions on the special install of the Riemann relations. Then, the database of Riemann relations in Invar must be downloaded and installed separately.
Follow the Instructions linked on the xAct Homepage first to load the main xAct package, which contains the Invar kernel.
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