License for Staging Environment Website

I have a website using Clean Education Pro theme.  It needs to move to a new server and requires a lot of fixing before it can be made available to the public.  I made a copy of said website on a staging environment.  The WordPress dashboard is telling me the license has expired because it is on a different domain that is only accessible within my organization's network.  What can I do to have both the old live website and the upcoming staging website use the same license? live website:  subdomain.extdomain.com staging website:  subdomain-stg.intdomain.com Thanks in advance, and have a great day.