The Nagios XI free license key allows you to monitor up to 50 nodes for personal and non-commercial use.  There are no node limitations in Nagios Core.

If you would like to purchase a commercial license for more than 50 nodes, you can do so by visiting www.nagios.com/products/nagios-xi/ or contacting sales@nagios.com

You can find this information along with other info at our faq page here- https://www.nagios.org/faq/

Let us know if there is anything else we can help with. 

I just setup CSP-1.2.1 ova ands the CSP50 free license does not work, it keeps asking for token/client ID and states license key invalid

Hey datagnan, sorry that you are running into this issue. The CSP50 license is entering an expired state so that may be causing the issue you are running into. I'll check to see if these changes have been pushed yet and get back to you.

When you are in the application, what version of XI do you see in the bottom corner. If you are in 2024R1.4.4 then that license no longer works.