Hello. Can i create a game with my friend in this same time?
Please Help. FASTTT.
Yes you can.
Thank you for your answer. But I mean more that like me, for example, I write scripts and a friend makes a map. And when I finish scripting, he can see my scripts and I see the map he built. Thank you in advance
You can still use source control outside of the editor. The plugin just makes it a bit easier.
The original answer was correct and is the way most people do this.
You can also do live map editing Getting Started with Multi-User Editing | Unreal Engine Documentation and it talks about source control as well.
But i have 4.12 unreal engine. And in plugins doesn’t have this plugin.
(Im From Poland No Hate)
No hate 
You can still use source control.
I Doesn’t have plugin 
Why are you running a 3 year old engine version?
But in 4.15 or newest version doesn’t have normal one script. And i install 4.12 to do one script.
HOW!!!
Too big of a topic for here.
Git for UE4 / Unreal Engine 4 - YouTube This video shows how to do it. It also covers the plugin… but how to do it with a GIT client outside of UE4. There’s a lot of documentation \ tutorials out there on how to use source control.