I keep getting a "failed to install" error when trying to install this set of 2 nodes from the Palette Manager. Is there a way to do this directly from a command line???
Go to your .node-red folder and run
npm install node-red-contrib-whatever
obviously using the name of the node you are trying to install, you haven't told us. It will probably fail, but then post the output here (copy/paste if possible please, not a screenshot). Use the
</> button and paste it in.
If it is node-red-contrib-midi then probably worth reading this issue against it first. There is a solution there.
[Edit] the fact that there has been no support for the last four years suggests that using this node might not be the best route to take.