The community will undergo maintenance on October 16th at 10:00 PM PDT and will be unavailable for up to one hour.
Did you find an installer for version 4?
Here you can find Creo 4.0 package (Win 64 DVD (4.101 GB) and HelpCenter (1.465 GB)): https://support.ptc.com/appserver/auth/it/esd/academicFree.jsp