The app had unique tie ins to the hardware and some real custom programming that made ripping a functional app impossible. However, it has finally been done by Tom Hounsell, who's been very big on the XDA seen and led the charge on making these apps available for all (who have a developer unlocked device).
So what changed? HTC evidently "...did the kind thing and removed all the breaking code from the old version" as Hounsell informs us in a Tweet. So does HTC want us to rip these? We doubt it, instead it was probably done to just make things easier. Regardless, we loaded it up on our LG Quantum and had no issues running it, making it a great addition, much to HTC's probable disapproval.
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Daniel Rubino is the Editor-in-chief of Windows Central. He is also the head reviewer, podcast co-host, and analyst. He has been covering Microsoft since 2007, when this site was called WMExperts (and later Windows Phone Central). His interests include Windows, laptops, next-gen computing, and watches. He has been reviewing laptops since 2015 and is particularly fond of 2-in-1 convertibles, ARM processors, new form factors, and thin-and-light PCs. Before all this tech stuff, he worked on a Ph.D. in linguistics, watched people sleep (for medical purposes!), and ran the projectors at movie theaters because it was fun.