Unity 2021.3.2 breaks this plugin

[endasil]

After the release of Unity 2021.3.2 unity bumped Newtonsoft.Json to version 13 making this plugin break, so you would need to update it. If you can give me access to push a new branch and create a PR I would be happy to do the work for you as I did that update for myself and shared a unitypackage with the updated dll here sketchfab/unity-plugin#18