For the Pack callgraph in trying to login
(https://eu.swi-prolog.org/openid/login?openid.return_to=https%3A//www.swi-prolog.org/pack/review) to leave a response under Reviews could not login.
Clicked 
Selected my Google account (No image given as it would contain e-mail ids).
then redirected back to
https://eu.swi-prolog.org/openid/login?openid.return_to=https%3A//accounts.google.com/pack/review#
Clicked
Selected my Google account (No image given as it would contain e-mail ids).
then for https://accounts.google.com/pack/review# received 404 error.
However for the SWI-Prolog documentation (https://www.swi-prolog.org/pldoc/doc_for?object=manual)
I am able to successfully login. 
There is no need for this to be fixed soon as I was just wanting see if Samer Abdallah would consider some changes and note how to use the pack on Windows using WSL (ref).