Sofya - Thanks for your question. Sorry for the delay in responding. This community is for questions/suggestions about the communities in general. I will move your question to the more appropriate PADS community where it will receive greater visibility.
If I remember properly CreatePDF was added in V9.1. I see two options:
1). Get a PDF printer (CutePDF is free, there are others) and print to a PDF file from 2005.1; you won't have any annotation info but you will have a PDF.
2) Get the latest demo of PADS, load your 2005.1 design, and create the PDF.
This thread got moved to layout; are you talking about creating a PDF in Layout or Logic?