If you are the proud owner of version 1.0 of The Solitaire of Champions, you will need to move and rename your high scores file. To convince Gaps 2.0 to use your old high scores file, rename it "Gaps Highs" and drop it in the Preferences folder in your System folder. (Note that you do not need to do this if you have been using version 1.1 of The Solitaire of Champions.)
Also, note that the separate graphics files are no longer needed. I've managed to shrink the contents considerably, and no longer feel any need to keep them separate. If you haven't done so already, you may throw away your old B&W Resources and Color Resources files.
Finally, if you get a -108 error trying to start up the game, that's an out-of-memory error. All you need to do is allocate more memory to the program. (Click the Gaps icon once, choose Get Info from the File menu, and increase the Preferred Size number.) This is the second time I've had to increase the memory allocation -- the last increase seemed to fix startup problems for most people, but not for everyone. If you do encounter this error, please e-mail me to let me know.