I don't know what has changed, but I can no longer add a Sub-domain as http. When I go to add a new sub-domain it only shows up as https now, which gives me a warning as I don't have nor plan to use an SSL on this site. This is when trying to use the added sub-domain from inside the Installatron Application. But I also tried to do a manual app install and still getting my sub-domain redirected to https.
Solved! Go to Solution.