How to update unreal engine 4.0 / 4.1 to 4.4 .

Anyone please tell a way to update ue4 engine 4.0 / 4.1 to 4.4 .

In the launcher you just have to install the latest version:

I only have unreal engine v 4.0 so how?

Can you explain please how to do .

Click the + button where it says Add Engine, then it will list all of the available versions

Ok thank you very very much.