If a Joomla update of Remository or UserPoints fails, and you visit the link shown by Joomla for downloading the software, you are likely to get this failure message. It is followed by more text. If the upgrade fails, attempting to download the link is also likely to fail. What the message is trying to tell you is that you must have a current subscription, and have entered your user token into Remository. The user token can be found on the profile page when you are logged in. It is stored by going to the Remository Options (in the admin interface). The user token is the first item in the options.
Support Services
Please consider looking at the Remository documentation to see if it answers your question. Or search the question and answer section here. If you are unable to solve your problem that way, please raise a support ticket. Subscribers have priority support - usually a response within one working day. Tickets from others may receive limited attention.