The error that is being logged is
Jul 11, 2019 13:58:10.106 [0x14fbcf1f8700] ERROR - Unzip: could not set executable bit on output file
Jul 11, 2019 13:58:10.106 [0x14fbcf1f8700] ERROR - CodecManager: failed to extract zip
Jul 11, 2019 13:58:10.106 [0x14fbcf1f8700] ERROR - Error configuring transcoder: Decoder install failed: eac3_eae
This would arise if the destination folder is on a mounted volume and the /etc/fstab does not have “exec” set or “noexec” not absent
Previous report of this SOLUTION: Conversion failed. The transcoder exited due to an error
Please see dialogue there
The unzipping is probably to a temp directory and it is failing to set the execute bit on the file
The target directory after unzipping would be /config/Plex Media Server/Codecs/EasyAudioEncoder-xxxxxxxx/EasyAudioEncoder