After downloading and moving Kaleidoscope into the Application folder, you are ready to configure it to work with GitKraken. Open the Integration window over Kaleidoscope application menu > Integration…
In the Integration window, navigate to the Git section:
First install the ksdiff command line tool, afterwords make Kaleidoscope Git's default diff and merge tool.
In GitKraken, open the Preferences by clicking the gear icon in the toolbar.
In the General section, select Kaleidoscope as External Merge Tool and External Diff Tool:
And that's it, you're all set to start using Kaleidoscope together with GitKraken.