1) bug 1
content from crash .txt is as below :
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HTTrack 3.33.20 closed at '\Dev\htsback.c', line 586
Reason:
assert failed: p >= 0 && p < back_max

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2) Bug2
I am actually using WinHTTrack Website Copier 3.34-alpha-5 (+swf) version but
in crash file it was recorded as 3.33.20 version as above!!

Reply about 1 st bug as application terminates frequently with fatel error.