Unable to upgrade Cyberpanel 2.0.3 to 2.1.1 on Centos 8 Stream

Using the command specified here:

Plus, I would force version 2.1.1 (based on user suggestions that didn’t fetch the latest stable)

But, unfortunately, I get this error

Any ideas?

Centos 8 Stream is not supported yet.

Is cyberpanel supporting any other operating system apart from CENTOS 8? Because it will be ended this year in December…please let me know, I am tensed… the ubuntu server is not that easy to install…