Senitrus OS? Subscription is unique as you are essentially renting the OS. Senitrus OS is otherwise only available on Senitrus PCs which might be out of the reach of your ability to afford a computer. With that in mind, and the fact that Windows 11 no longer supports many good and capable PCs, it forced someone to either install another OS, or buy a new machine. Senitrus OS Subscription is the only way to get Senitrus OS installed on the computer. Another option is to breathe new life into an older machine that may no longer be able to support many OSes including Windows 11. Therefore, many Linux Distributions are intended to meet for the needs of those PCs.
Senitrus is $15USD per month, or $150USD per year. When paying annually, you are saving $30 over the course of the year. If you are not sure, you can always pay the monthly subscription to give it a try. There will be a one time 30 day trial. If you don’t like it, and want your money back, you would uninstall the OS from your computers, and go to https://oss.senitrus.com/refund and apply for a refund. You can only do this once even if you wished to give it a try when a new version is released.
Senitrus OS will support installation on 3 machines per Senitrus ID. If you have 4 computers that you wish to install Senitrus OS, you would need to pay for 2 subscriptions, and that would cover for 6 machines. Even if you were to acquire a second Senitrus ID, you would still pay for that second subscription, but now your fourth machine is not using your primary ID, and therefore may have a harder time with integrating into the other 3 machines.