Problem to install from source forge

Hello ,

Thank you very much again for this new release.
I have have some trouble to update the CAElinux add-ons or other new features. I followed the readme on sourceforge.
However, I have this message
GPG error: downloads.sourceforge.net 2013 Release: The following signatures were invalid: BADSIG 3D10E8043D501626 CAELinux Admin < This email address is being protected from spambots. You need JavaScript enabled to view it.>
Do you know what I did wrong.

Thank you very much for your time.

Best regards