Is it possible to install Cyanogenmod on a SPH-D710 (Boost Mobile S2)? How do you go about doing it? I couldn't find any instructions for installing the latest version of Cyanogenmod on it anywhere.
CyanogenMod does not officially support the Epic 4G Touch (SPH-D710) phone. Your best bet would be finding an unofficial port over at XDA-Developers forums.

From the looks of it, Jelly Bean 4.2.2 and 4.3.1 are the latest versions of custom ROMs that are available.  These are not pure CM though. Details and installation instructions at the links.