On the screen:

A fatal error has occured
assert failed: sz+szf+1<sizeof(infobuff)
in file c:/dev/winhttrack/htscore.c, line 2347

A fatal error has occured
assert failed: sz+szf+1<sizeof(infobuff)
in file c:/dev/winhttrack/htscore.c, line 2346

In crash.txt:

HTTrack closed at 'C:\Dev\WinHTTrack\htscore.c', line 2347
Reason:
assert failed: sz + szf + 1 < sizeof(infobuff)