Import files from creo Elements

Hi, I'm new to the forum. I've been using the free version of Creo Elements and I have about five files in pk2 format, one of which is important. I now have a Creo Parametric license, but I can't import pk2 files. How can I transfer the files from one software to the other? Can someone convert them for me so I can use them in Creo Parametric? Thank you very much for your help.