Install R custom packages on Spotfire Server to be used in Web Player

I want to know how to Install custom R packages not available in TERR or R public packages (currently have this in-house built package in a folder) on Spotfire Server.
 These packages are used in a dashboard and the Web Player should use these packages and the script would update dynamically the data on Web Player.
The problem came some time ago when we have migrated to Spotfire 7.12 and the old Spotfire was looking at a local folder for custom R packages (the dashboard was working perfectly on Web Player) while the new one doesn't have this link to local folder and the dashboard with custom scripts is not working on Web Player.
Many thanks in advance.

(4) Answers