Issues opening project in Cubase Artist 6.0.7.

Hi - I wonder if you can help me. I am trying to open a project I created a few months ago. The project was created in Cubase Artist 6.0.5, but I have since loaded the patch to Cubase Artis 6.0.7. I am getting an error message stating "Project was created with Cubase Artist Version 6.0.5. This program version cannot load it. Any solutions for this? I have other projects created on the same day that I can open fine! Any help appreciated! Thanks.