Trying to sync a paid subscription to substack - 
Thanks for some thought how to move this forward:

The output give me the structure of the page then disappears to a "Page not
found - Failed to load posts" message.

I am signed in and grabbed connect.sid cookie to cookies.txt.
Transferring this cookie to a new browser keeps me signed in.
no spider rules - excluded logout url - 
Included sitename url and substack.com

Warning log:
17:17:30 Warning:  Moved Permanently for substack.com/
17:17:30 Warning:  Redirected link is identical because of 'URL Hack' option:
substack.com/ and <https://substack.com/>
17:17:30 Warning:  File has moved from substack.com/ to <https://substack.com/>
HTTrack Website Copier/3.49-2 mirror complete in 1 seconds : 3 links scanned,
2 files written (148768 bytes overall), 2 files updated [35657 bytes received
at 35657 bytes/sec], 148768 bytes transferred using HTTP compression in 2
files, ratio 21% (No errors, 3 warnings, 0 messages)