Hi, author here. This is definitely not a case of using shoddy app stores or installers. The vast majority of the problems stemmed from installations that came from Google Play. The article mentions a tidbit about alternate installation sources as a heads up / piece of advice for people running into the problem because we were still confused as to why it was happening for a small number of people. It just turned out that they were using shoddy app stores / installing manually, and were installing the wrong version for their device.