> HTTrack 3.33.20 closed at 'Devhtsback.c', line 586

Fixed in -a7

> 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!!

Yes, this is perfectly normal: 3.34 alpha/beta releases are tagged (3.33.XX)