"A feature with ID ....... has already been installed in this farm."

Reinstalando un WSP en mi granja 2010, he tenido un error a la hora de reinstalarlo:

A feature with ID ....... has already been installed in this farm. Use the force attribute to explicitly re-install the feature.

Para poder instalarlo o bien reinstalarlo a la fuerza, usa el siguiente comando de PowerShell: 

Install-SPSolution -Identity  -GACDeployment -Force