Hi Dan,
Thanks for your question.
In order to successfully instal the Projectplace Plug-in on a computer you need to be logged in as local administrator.
If you are and the problem persists check if there is an older version of Projectplace Plug-in installed on the computer. Please uninstall the old version and reboot before attempting to instal again.
Good luck and don't hesitate to contact us again if the problem persists.
Best regards,
Karolina