Source [My UE subscriber email]
Today, Epic has opened up Unreal Engine 4 to the world! UE4 is now available for download in its entirety, including the full features, tools and the entire C++ source code for PC, Mac, iOS, and Android through a subscription plan. You can subscribe to UE4 for $19 per month, and ship games with UE4 commercially by paying 5% of gross revenue from product sales to users.
The engine includes lots of free content, including template games, sample games, content examples and more from the built-in Marketplace.
To get started, visit https://www.unrealengine.com.
NEW SUPPORT CHANNELS:
We've launched all-new UE4 forums and community support channels. Since the new forums are a clean slate please create a new account right now to reserve your unique display name. We're sorry for the inconvenience.
Once you create an account, you can post on the new forums, AnswerHub and the Wiki.
You are invited to check out our new user FAQ, official documentation, video tutorials and everything else available today.
IF YOU'RE USING THE ORIGINAL UDK:
You're free to continue using UDK and releasing products as planned.
You can continue using the UDK forums with your existing login.
UE3 docs remain available on the archived Unreal Developer Network.
If you're early in development or starting a new project, we recommend moving to UE4.
Thanks for being part of the Unreal development community. We hope you'll join us to experience a new generation together with Unreal Engine 4!
Your friends at Epic