There is an issue when trying to access some products specifically gtk themes
I’ve found this error while loading these and others themes:
https://www.gnome-look.org/p/1267246/
https://www.gnome-look.org/p/1640981/
It is now displayed again. We apologize for the inconvenience. If you experience any further problems, please let us know.
It’s working fine now, Thanks!