I have just encountered a similar problem on my Mac. I bought an ebook which came with ADE. I was able to read it, no problem. Then I upgraded the Mac (after backing up everything) from OSX 10.5.8 to OSX 10.6.8; and now ADE cannot see the ebook, though it is where it should be! Evidently the link has been broken by the upgrade, but how can I repair it?
This is my first venture into the world of ebooks - and I am not impressed!
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If it says missing, then ADE can't find the file. You should bring up the info dialog (select it and press ctrl+i) to see where it thinks the file is, and try to look for it there on the old computer.
I'd better explain that with me there's no 'old computer', it's the same one with an upgraded OS. Also, I knew exactly where the file was, though ADE didn't! I had a look round various possible sources of advice on the web; some suggested that I rerun the .acsm file used to install the ebook, but it was not in the ADE directory. I did come across a new version of ADE itself (2.0) so I installed that; and while it was downloading I noticed that the .acsm file I needed was still in the 'downloads' folder. So when ADE was installed, I reran the .acsm file, and a second copy of the ebook appeared in ADE and I could read it! I deleted the 'missing' ebook and all was well.
This remains the valid answer, and you should get credit for it. Selecting and using Command-I (Mac) gives you all the information you need to search "All My Files" for a fair-sized chunk of the relocated file-name(s). In Mac OS, you then drag and drop it/them onto the open ADE page. They will then show up as new books, and you can delete the ones that showed as missing.