Sorry, but the SP needs to be installed on both nodes. I would suggest the following:

1, Locate the "Passive" node (Node 2) and install the SP on it.

2, Failover from node 1 to node 2 and install the SP on node 1

3, (Optional) Fail back to node 1 after installing the SP if you want node 1 to be the preferred node.

Good luck!