I’ve even create a new admin user and signed in there to see if there was some weird permissions issue that prevented me from doing it, but a fresh admin would work, but it doesn’t work still…
Even when I click on “Theme Details” the delete option is gone for me. I also don’t have the “add theme” option at the top of the page. I can only activate the themes that I have already installed.
There is only one user on this account (me), and it’s a full administrator account.
Here are screen shots of what I’m talking about
No delete: https://www.dropbox.com/s/oja9yww0of07hpz/No%20Delete.JPEG?dl=0
No add: https://www.dropbox.com/s/4p7n5xew6d37a4h/No%20Add.JPEG?dl=0