You can download the latest .apk here:

http://dl.bintray.com/rfo-basic/android/v01.78/Basic.apk

(Don't take my word for it though - that would be a security risk. I could be a malicious actor! Poke around on the site and you'll find the link.)

Incidentally, I always do this (or use F-Droid). Google Play gives me the creeps. It angers me when supposedly "free" (as in libre) software only offers binary downloads through Google Play, or makes the .apk difficult to find. Prominent links to a downloadable .apk, people!