I realized that I forgot to put the desired directory in the "Add URL" box with
the captured login page.

Now, HTTrack correctly scans the targeted directory but it's still not able to
download the .asp files in the directory.

In the ht-log file, I see I'm getting bunch of warning messages that read like
this:

Warning:  File has moved from www.domain.com/databases/folder/?secured=true to
/login.asp

So, it seems like HTTrack is just being bounced back to the login page without
being able to download the files.  

Is there any way to solve this problem?
I'm currently using this captured login page:

<http://username:password@www.domain.com/login.asp?>postfile:C:\Folder\hts-post0>