To manually install Craft for Sketch, follow these steps:

1. Copy and paste or drag and drop Panels.app from this folder to your Application folder.
2. Select and copy all three files ending with *.sketchpanel (Duplicate, Photos, Type).
3. In Finder, click on the Go option in the top OS X menubar and click Go to Folder...
4. In the window that appears, paste ~/Library/Application Support/com.bohemiancoding.sketch3/ and click OK
5. Make a new folder called “Panels”
6. Paste files from Step 2 into the new Panels folder.
7. Run the Panels.app from your Application folder.
8. You’re all set! Enjoy Craft.