I wanted to mirror a site that a client wants to move from boomtownroi.com. 
But no site there can be mirrored using this software. 

Here is the latest test site data from HTTrack (I used the default settings in
HTTrack).

"HTTrack3.48-22+htsswf+htsjava launched on Tue, 04 Oct 2016 00:23:24 at
<http://www.searchnashvillerealestate.com/> +*.png +*.gif +*.jpg +*.jpeg +*.css
+*.js -ad.doubleclick.net/* -mime:application/foobar
(winhttrack -qwC2%Ps2u1%s%uN0%I0p3DaK0H0%kf2A25000%f#f -F "Mozilla/4.5
(compatible; HTTrack 3.0x; Windows 98)" -%F "<!-- Mirrored from %s%s by
HTTrack Website Copier/3.x [XR&CO'2014], %s -->" -%l "en, *"
<http://www.searchnashvillerealestate.com/> -O1
"C:\Users\jimhu\OneDrive\httrack\test a" +*.png +*.gif +*.jpg +*.jpeg +*.css
+*.js -ad.doubleclick.net/* -mime:application/foobar )
Information, Warnings and Errors reported for this mirror:
note: the hts-log.txt file, and hts-cache folder, may contain sensitive
information,
 such as username/password authentication for websites mirrored in this
project
 do not share these files/folders if you want these information to remain
private
00:23:25 Error:  "File Cache Entry Not Found" (-1) at link
www.searchnashvillerealestate.com/ (from primary/primary)
00:23:25 Warning:  No data seems to have been transferred during this session!
: restoring previous one!"

What is blocking HTTrack from mirroring sites hosted by boomtownroi.com?