Want to know what EndNote has to offer? Try our free series that guides you through the entire process. Read more here.
You can install the trial (demo) of EndNote and use all of EndNote's functionality. After the trial period, however, EndNote reverts to a reference viewer only.
With this said, none of your work is wasted.
As soon as you buy an EndNote license, you can unlock your trial to full functionality again, with all the references you added. You can buy an EndNote license here https://www.alfasoft.link/buyendnote
As soon as you have your product key, in EndNote click on Help>Activate EndNote