Hello Dave,
Thank you for your message.
Could you please clarify what version of Remote Utilities do you use? In case if you use version 7.0.0.3, please note that your license key from version 6 is not compatible with it. In this case, please generate a new key using
this form. You will receive your key as file with a
.rlicense extension - with this key you can register your Viewer as
described here.
Hope that helps.