I tried one page ('home') as suggested in another thread) but same failure.
The full log (with url redacted) is:

HTTrack3.49-2+htsswf+htsjava launched on Tue, 27 Apr 2021 11:27:18 at
<https://www.***REDACTED>*** +*.png +*.gif +*.jpg +*.jpeg +*.css +*.js
-ad.doubleclick.net/* -mime:application/foobar
(winhttrack -qiC2%Ps2u1%s%uN0%I0p3DaK0H0%kf2A25000%f0#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, *" -P
***REDACTED***: <https://www.***REDACTED>*** -O1 "C:\My Web Sites\TSGS" +*.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
11:27:19 Error:  "Forbidden" (403) at link <https://www.***REDACTED>*** (from
primary/primary)
11:27:19 Warning:  No data seems to have been transferred during this session!
: restoring previous one!