All the way to the bottom of this post thread - review the last two posts:
Both the EPIC (or RIO) and the computer that you have the Node-RED editor open on MUST have a valid gateway to the internet to be able to install any nodes and their dependencies.
Installing from the host is not really an option for a few reasons.
Best way is to install via internet.
Next best way is as Gerhard pointed out, install the node on a groov of the same time and firmware level that does have internet access, then back up the Node-RED project and move that backup to the off-line groov and restore it.