These two problems are characterized by the user being unable to succesfully input their product code into "Simple License Entry" box. It can appear as one of two possible errors...
The "Simple License Entry" field is greyed out and the user cannot input text in the box. A screenshot of this error is shown below.
After inputting the product code and clicking "Install Licensing" the user receives a red "License Failed!" error message.
Both of these errors are caused because something is interferring with your ability to contact our licensing servers. This could be because of an anti-virus, admin permissions, firewall, or network issue. The guide linked below will walk you through the process of generating a license file manually and installing PTC Creo 2.0 without using the "Simple License Entry".