ctfchallenge.com is now HackingHub.io you'll still be able to find all the challenges your used to and more! You can use the same login credentials from this platform on HackingHub. Premium subscription has been currently discontinued and all challenges are currently free of charge. We don't currently have a premium service on HackingHub but as soon as we do anyone who's purchased premium/season access from CTFchallenge will be looked after, we'll contact those people when the time is right.
Thank you for your support, and we look forward to seeing you on HackingHub, please reach out on our HackingHub Twitter/X account for support @hackinghub_io