Hello- I do hope someone can help.

My wife was a franchise-owning editor of a news website:

www.aboutmyarea.co.uk/Cheshire/Neston

When when she retired in 2020, I successfully used HTTrack to download & save
an offline copy of it for posterity (personal use only). We have been able to
browse this copy successfully ever since - until we had occasion to do so
again today. :-(

As it happens, the original website itself has recently been taken down (no
longer exists). I am wondering if there is anything in the 'offline copy' that
is still attempting to reference the original website, and because it can not
find it on the web, fails to render any of the offline pages anymore on our
home PC?
Id this something that has happened before, and if so, is there any advice on
how I might identify the obstructing external reference in the code, and
fix/remove it, so we can once more browse the offline copy of the site? 

Eternally grateful for any help!