I got the same Problem, too.
I want to install Creo 3.0. After using the license-code from the pdf and entering my username and password, I got an error. (Username and password both correct!!!)
I tried to skip the part with the license, but then I will be asked for the license when I opened creo and I can´t use creo.
got the same licensing problem with the academic version of Creo 3 (WIN10-64).
My Username/Password are not accepted during installation, but there is no problem for me to log in on ptc.com.
If i check there my license status, nothing can be found.
I have tried it as admin and standard user and tested several keys, found in the installation pdf and here.
Can anybody help me?