Did you select all of the option/checkbox to provide permission to work the API when you have created the Envato API Token?
If not, please create an another Envato API Token or update the existing token to select all of the option/checkbox to provide permission to work with the API.
Moreover, please note: the script/plugin will take time based on items. Example: if your profile has huge item, then it will take time to load.
Best Regards,
ThemeLooks Support Team