I can import same backup into 8.3 without any problems.

017-09-29 12:24:35 Importing text file: TB170904.TXT
2017-09-29 12:24:35 Database set to unsafe (import and maintenance) mode
2017-10-05 15:36:30 activate language ENG done
2017-10-05 15:36:30 *** running with new mail receiving and parsing ***
2017-10-05 15:36:30 *** Using Clock Replacement ***

2017-10-05 15:36:30 Last session was not properly terminated
2017-10-05 15:36:30 *** using a freelist to keep track of free space ***
2017-10-05 15:36:30 *** RELOAD UI FULLY ***
2017-10-05 15:36:30 *** RELOAD LANGUAGES ***
2017-10-05 15:36:30 activate language ENG
2017-10-05 15:36:30 functiontag HasModHotel modulename modHotel res 0
2017-10-05 15:36:30 activate language ENG done
2017-10-05 15:36:30 Database ID is: BFB4FDFD0854F804C54C1685D5E2C199

2017-10-05 15:36:30 Importing text file: TB171005.TXT
2017-10-05 15:36:30 Database set to unsafe (import and maintenance) mode


In terminal i have a segm fault 11 message.