Enterprise license for non-game application
Correct. If you do not earn revenue, you do not owe royalties under the UE4 EULA (https://www.unrealengine.com/en-US/eula).
Royalties are also not owed under the Enterprise license, which is intended for non-game development. You can review those terms here: https://www.unrealengine.com/en-US/studio/eula
answered Oct 10 '18 at 06:17 PM
Most likely yeah you can use it free of charge forever if you really wanted to. If you feel like you need UDN access(Epic support) I'd recommend getting the enterprise license. The UDN is GREAT for the more advanced topics that are out there.
Follow this question
Once you sign in you will be able to subscribe for any updates here