No need to install MidiInChecker2. Simply you can put MidiInChecker2.exe where you want to.
MidiInChecker2.exe doesn't require other DLL files (FDK.DLL etc)
How to use
Connect PC and E-Drums with MIDI I/F. Then Run MidiInChcker2, and Hit any pad in E-Drums. In case PC and E-Drumes are connected successfully, MidiInChecker2 shows logs whenever you hit pad. Usually, 1 pad-hit will invoke 2 logs (Note on, Note off) with pad-related Note number. (In some E-drums models, or In some E-drums settings, E-drums may not output Note-off)
If no logs are output whenver you hit any E-Drums pads, it means you failed connecting between PC and E-Drums. Please check
"MIDI-IN" (or "TO MIDI-OUT") of PC (or USB-MIDI) and "MIDI-OUT" of E-Drums are connected. If it's no problem, then Power-Off E-Drums, and power-On E-Drums. (In other words, reboot E-drums)
If you connect both USB (PC and E-Drums), then check USB connection, and reboot E-Drums.
Notice
You'll need some MIDI knowledge, if you want to understand the output of MidiInChecker2 well.