You can re-download the .exe. It will create a log file in uncropMKV.exe folder.
Code:
[02:36:37] Pre-processing input file (captivity-tlr2_h1080p.mp4)...
[02:36:48] Detected video: ID#1:V_MPEG4/ISO/AVC:1920x800 23.976fps (AR:2.4)
[02:36:48] Video height not compliant (480/576/720/1080)!
[02:36:48] Detected audio: ID#2:A_AAC:audio (44100Hz/2ch) Language: und
[02:36:52] Will keep track#2, Audio, A_AAC, und, 44100Hz 2ch
[02:36:52] File queued: captivity-tlr2_h1080p_new.mkv
[02:36:54] Re-encoding with x264 (captivity-tlr2_h1080p_new.mkv)...
[02:36:58] Will keep track#2, Audio
[02:36:58] mkvmerge: ...
[02:37:00] Done!