If you receive the following error "Document Access Denied. You have already registered your quota of machines", this means that you have reached your limit of the number of unique machines that you are allowed (currently set to six machines).
Sometimes, by uninstalling and re-installing the FileOpen plugin, it will treat your machine as a new instance, thereby utilizing one of your available machine instances.
If you feel that you have not used all of your six machines, please send an email to learning.services@nokia.com to request any older machines be removed.