Any https page is automatically redirect to a http page rendering vituemart shops useless.
Support provides no answers:
Sorry you had problem with this particular question. However, there is no repoted issue within sh404sef regarding https. Setting up the joomla, virtuemart and the web server to operate may however be quite complex, especially on shared host, and thi smay be the reason of your issues. There are many Virtuemart shops running https for the checkout parts as we speak.
I can only encourage you to go back to our forum to try get this setup properly
Thanks and regards