I am trying to install new themes (freedom and bookshelf themes) to my fresh Omeka S installation, following the procedure given in the user manual. I’m using Omeka S 4.1.1.
Unfortunately, when I try to select any of the new installed themes, I got a red error message : “Invalid theme.ini file”
It’s hard to help without more information, but I’m guessing you have the themes unzipped a level too deep. In other words, the freedom folder is within another folder; thus, Omeka doesn’t see the theme.ini where it expects it to be.
Usually in this kind of situation this indicates a permissions problem of some kind. You might compare the permissions of “default” and its subfolders to your new ones and see what differs.