I put this on the Apple discussion board, but heard nothing, so hoping someone here might have some comments. I have V9.1.5 on an iMac i7, under 10.6.8. My first version was 5.5 complete with the Emagic key, and the current version is from a series of updates via Logic Express and Logic Studio. I will be working with a composer a few thousand miles away, and thought I would move Logic to my MBP for a few weeks for these sessions. I installed as per usual on the MBP under Lion. I was prompted for a SN and the Emagic key at the start, and did the installation of V9.1 from DVD. This would not run under Lion, so I applied the 9.1.5 update. On launching Logic, I was prompted again for SN and Key. This time, Logic reported that my key was not eligible for this update. Can anyone think of a reason this would not work? It makes no sense given that I was able to update to 9.1.5 on the iMac with the same disks, SN and key. The only thing I can think that is different is that on the iMac I the original Studio update to get to Logic Pro 8, then the Studio 2 update to get to Logic Pro 9.