Sometimes when installing plugins you might get the error “Plugin not activated. A higher version of %% is needed for this theme. Please update the plugin”
This issue usually happens because there are multiple TGMPA libraries loaded and they conflict.
This internal library is used to download, install and manage plugin dependencies.
The solution that works in most cases is to temporarily disable all other plugins (except Rey Core) that might use this library and retry installing that plugin that gave the errors.