You can inject your own proxy models into the offline library (2021 method):
: Once the download is complete, you can use these assets even when your workstation is disconnected from the internet. Chaos Docs Requirements for 2021/3.3 Setup Software Compatibility : Enscape 3.3 is compatible with SketchUp 2021 enscape 33 asset library offline 2021 download
If you open the library and see missing textures or pink assets, it means Enscape is still trying to stream online assets but cannot connect. Go to the Enscape Asset Library window -> Preferences -> Check "Use Local Assets" . You can inject your own proxy models into