This build of Cfish is bundled with Other (Stockfish) Engines app by Javier. In case you want to install it directly under your favorite GUI without using OEX functionality, you can use THIS binary prepared for arm7 pie devices.
As a complementary useless information, let me remind that Cfish is probably the strongest Stockfish version available by definition because the same source is recoded using C instructions instead of C++. You may expect from 15 to 25 ELO more over an official Stockfish build of the same date.
In case of trouble downloading from your PC, use your mobile device or refer to THIS POST.