Alright, I believe I have solved it, had to due with an incorrect default GROUP_ID variable. New template should be available in a few hours, you'll need to uninstall and redownload from the CA store. To be on the safe side, you should also delete the files inside the "webtrees" folder in your appdata (should only be one "config" file).
I've also removed some unnecessary and/or confusing variables, including the DISABLE_SSL. You can see what's left/altered under "Advanced", but I'd recommend leaving them as they are.