Creo 4.0 student licence does not work with other internet
I have quite an interesting problem: As Creo 3.0 (Student version) stopped working today on my desktop and notebook although everything worked properly yesterday I decided to install Creo 4.0 (Student version) instead. At the licencing-part I started to struggle. I used the licence provided in the pdf and it said "unvalid file or format" but then i tryed it with the internet provided by my mobile phone and it worked and Creo started. But now as I changed back to my normal internet I get the error "Invalid host" when starting Creo 4.0. Does anybody know what is wrong here or what I can do?