We have added new versions of the operating systems CentOS-8-amd64, Debian-10-x86_64, Ubuntu-18.04-amd64, Ubuntu-20.04-amd64 for clients using the VPS (virtual server) service.
In order to install a new version of the operating system, go to VMmanager, select your VM and click on the Reinstall button.
IMPORTANT !!! After this operation, all data will be erased, so before changing the operating system you should backup the data!