Extension ware house is not work

[manojruchal200]

extension ware house is not work

[DaveR]

The Extension Warehouse works just fine but it does not support SketchUp 2021.

[dezmo]

This is one of the Unavailable Features in Unsupported Versions of Sketchup.

See more:
End of Support Policy

You still can use with limited functions via its web site opening it in your web browser:
SketchUp Extension Warehouse