Missing EXS24 instrumens after upgrading to logic pro 9.

Hi there.

I have recently upgraded from logic express 9 to logic pro 9. When I opened the project I was working on, I got a message that some EXS24 instruments were not found. I have done all the necessary upgrades after installing LP9, reinstalled the disks multiple times but the instruments are not to be found. I search in my finder and they just seem to be missing from the HD. I have seen multiple discussion on the net about similar problems, but they mostly involved new installation of the LP, not upgrading. And there are many sugestions about what to do, but all of them differ. How should I solv this problem?

Thanks.