Hello. 

We posted a new version with a fix for this.

Please try downloading and installing the latest version from:

https://renderplus.com/wp2/download/?product=autodesk

Let me know if you are still having trouble.

Thanks,

Rich

Hello,
I have buy a new licence version XE08w 1.0 on 2024/06/06, and installed it on my new Windows 11 machine with AutoCAD 2021. All problems are now solved, it works fine. Renders are 10 times faster on this new machine.