The Photon Theme is refusing to install with the following error
Template is missing. Standalone themes need to have a templates/index.html or index.php template file. Child themes need to have a Template header in the style.css stylesheet.
Any ideas how to fix this?
It looks like WordPress can’t find the required theme files. Make sure you’re uploading the actual Photon theme folder and that it contains style.css plus index.php or templates/index.html. If it’s a child theme, also check that style.css has the correct Template: header matching the parent theme folder name. A fresh download may also help if the package is incomplete.