I also had problems in getting the apk to install (parse error). What was happening was that when I right clicked on the apk in Github and clicked on download I ended up with a 24Kb file named Epubreader.apk. If I tried to open it with a zip archiver it wouldn't do it.
Examining the file itself it rapidly became apparent it was actually a html file rather than a apk, although it was named as an apk.
I then downloaded the entire repository as a zip file and extracted the apk from that. This works fine on my Android 4.1 tablet.
It may be a browser issue or I may have missed the point of how to download a single file, however if anyone else is having the problem a first check is the size of the file - 24Kb is not what you want; the apk that works is 347Kb.
BobC
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