You can always update the http:// to https:// manually in order to continue with the checkout process. 
Agreed but not everyone who purchases Powerstore will have the "expertise" to do this and I believe this needs to work out of the box
That url must be wrong or maybe only viewable locally for you. Is the https certificate installed and functioning properly on that test site? We just installed a cirtificate on our dev server to better test that it redirects properly, so we'll make sure to get it adjusted, but it would be helpful if you tested the rest of the process so we could incorporate any other suggestions you might have. 
The site is on my main server in a subdomain, you are welcome to try the site for yourself if you doubt what I am telling you. I have a wildcard SSL cert installed on the server specifically for this kind of testing if you visit powerstore.i-cre8.com/ you will see the certificate is working.


