The Unreal Development Kit has been installed more than a million times, Epic Games co-founder Mark Rein has revealed.
"This isn’t a download count nor does it count users who installed a new version of UDK over an old version, or reinstalls," Rein clarifies in a post on Unreal Insider.
"This means there are more than one million different computers onto which the UDK has been installed. With this massive installed base there are countless stories to tell about what these developers are doing with the technology."

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