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.