Thank you for your message.
By default the trial version is installed. You can generate a free license key and register the program as described here https://www.remoteutilities.com/support/docs/free-license/
By the way, starting 6.5 beta
we updated the installation wizard. Now during installation the Viewer asks whether you want to install the trial version or generate and apply a free license right away.
Let me know if you have other questions.