I would encourage you to use the V2 code paired with a Teensy 3.2. That way you can use up to date versions of the IDE and libraries without compile or Flash storage issues. The Arduino code barely fit into the ATMEGA chip at the time.
Google “ATMEGA328p pinout” for the pinout.
The SD files are configured for the V2 version. /00system has a bunch of system files and a couple subfolders with additional files.
V1 does work with INI files, as I recall.