I can see the HDHomerun app by searching on the box, but it isn't ready for downloading just yet (installing it on Windows 10 first may help). SiliconDust told Kickstarter backers last night that the app should be available within 24 hours, so it shouldn't take long to show up.
Those who prefer a DIY approach to the DVR haven't had as many options available since Microsoft decided not to extend Windows Media Center to the Xbox One and Windows 10, but the addition of Universal Windows apps means third parties can fill in the gap. SiliconDust is still developing the other parts of its DVR platform too, recently releasing an app for Windows Phone 10, as well as providing updates for the apps on Windows 10 desktop and OS X.
The update also referenced a recent issue with Samsung's TVs, where the last update disabled the RUI feature that let TVs connect directly to an HDHomeRun DVR server. SiliconDust says it's in touch with the "right people" at Samsung, but there are no specific plans to share right now. As far as other features users are waiting for, the company says trick play (the ability to pause, fast-forward or rewind live TV) will arrive by the end of the month, and it's still working on support for protected channels too.