No problem at all. Sorry I jumped in deep from your first post…
There are two main ways to install nodes on an offline groov device.
The first is to install the nodes on a groov device via the usual Node-RED manage pallet menu.
Once you have all the nodes you think you might need, you go into groov Manage → Node-RED menu and backup the project. That will zip up all your flows and nodes and save them on your PC.
Then, copy that backup to the PC that is on the same network as the offline groov and restore the project from the same groov Manage menu page on that offline groov device.
The offline device will now have all the nodes that you just installed.
If you have no flows on the online device, its a very clean way to ‘install’ nodes in the off line device.
If you do have some flows, just delete them on the offline device after you restore the project, only takes a second to do that.
You can read about how this process works in a bit more detail in this post here:
The other way is a little more involved, but does not require a second online groov device.
In short, what you are going to do is to download the raw node files in your online computer and then install them on the offline device via a USB stick or copy.