OK, solved the problem. I copied the Data folder into the Library folder of AM. No go. Then I found another reference on the Forums that advised coping the Data folder onto the main AM heading itself. I did, but unfortunately forgot that I had AM running at the same time. No matter. I closed the program, reopened it and there was the entire Library in the panel where it should be. The other reference described a fairly elaborate sequence for locating where these files are, at the end of which one click should make them all available. This turned out to be not necessary. As the moderator noted, suggestions for solving these problems on Windows are not very useful for Mac users. Thanks anyway.