winhttrack was stopped because of low disc space before any error occurred. 
This crash occurred some time after the next start, maybe the file old.zip was
corrupted - it did not open by windows explorer, but did open by 7-zip.
Then deleted old .zip and old.lst and prog seems to run now.
Here the contents of crash.txt as requested:
HTTrack 3.48.19 closed at '..\httrack\htscache.c', line 401
Reason: zip_zipCloseFileInZip_failed

Stack trace:
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StrStrW [SHELL32]
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unknown [WINHTT~1]
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PrintDlgExA [COMDLG32]
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