How to install Electronic Nodes on previous version of the engine? On custom build?
You'll have to compile the plugin yourself! But don't worry, it's not that difficult 😉
Just go to the epic launcher, and download the last unreal engine version under the tab "Library". (Yes, the screenshots are in French, but you shouldn't get lost 😛)
Once down, just scroll at the very bottom of the page (where the plugin are located) and install the plugin for that version.
I'll do the example for the 4.22 version, but you should do it for the last version of the engine!
It's really simple, it's under Epic Games/UE_4.22/Engine/Plugins/Marketplace (remember that in your case, it's not 4.22 but the last version of the engine)
Just right click this folder and Copy (or Ctrl+C)
Find your project folder, it should be under My documents/Unreal Projects/[The name of your project]
If you don't have a Plugins folder, just create it here.
Now, you just have to paste the ElectronicNodes folder here!
You can remove the Binaries and Intermediate folder, they'll be generated during the compilation.
Then, edit the ElectronicNodes.uplugin with your favorite editor (Notepad++, Sublime Text, VSCode, whatever)
Put the version of the engine you're using for your project next to the EngineVersion.
Save it, and we're all set!
Launch your project (you can do it by clicking on your .uproject file).
When you have this window, click Yes, and it will start compiling the plugin!
(Show log button. If there's an error it could greatly help to solve it)
Once done, the project launch as usual:
And you should see in the bottom right corner a message to activate the plugin. Just click on "Manage Plugins"
(If you don't have the message, you click on Edit/Plugins)
And it's done 🎉!
If you have any question or any problem with this, don't hesitate to create an issue 😉