I can't test - but log looks like there is something weird with your temp path for subs:
[code][DownloadControlAmazon]" "amazon before remux, audio file C:\\Users\\ .. \\Documents\\DVDFab\\StreamFab\\temp/outputTemp/ .. /Audio_00/at_00 is existed ? : 1, file size : 290088382
[Info]: convert result subtitle file c:%5CUsers%5C .. %5CDocuments%5CDVDFab%5CStreamFab%5Ctemp/outputTemp/ .. /Sub_00/st_00.srt is exist? : 0, file size is 0
[Critical]: "[DownloadControlAmazon]" transformXmlToSrtSubtitle failed, retry
[DownloadControlAmazon]" "Download, before remux, video file C:\\Users\\ .. \\Documents\\DVDFab\\StreamFab\\temp/outputTemp/ .. /Video_00/vt_00 is existed ? : 1, file size : 682130421[/code]