Currently, we have a “beta” programme for the Mac driver (macOS 11 support). Beta 6 is expected to have support for SketchUp 2021.
On Windows, we’re testing v. 10.7.1 of 3DxWare 10 (driver suite) but the software can be made available to customers upon request. Consider it a last-minute “beta” since we didn’t make it before the SU2021 release.
Hopefully, the above will clarify things a bit. Again, we regret the delay in providing the extension for SU2021.