I am attempting to install a theme I purchased some time ago (the support timeframe is expired). But the install fails because the .zip is missing a .css file.
Thank you Charlie, that’s exactly the message. What is the fix?
Edit: Stupid user error– I was trying to install the downloaded zip. The true installation archive was nested.
Follow option 1 in that link and use the “installable WordPress files” option and you should be good to go.