Sometimes getting SkookumLogger from the App Store fails, occasionally with an Alert about "unable to install, try again later." Some users have found that trashing the version in their Application folder, and any other versions found with a Finder search, then restarting their computer before trying the App Store update again resolved the problem.
Alternatively, you can download this latest release, but then the AppStore will not notify you of new releases.
SkookumLogger has a builtin Help Book that is the most current documentation. GØDVJ has authored a SkookumLogger Guide. Additional information is linked on the Hints page. There are no email reflectors, blogs, whatever, for SkookumLogger.
Contact K1GQ directly if you have a question or a problem. If you are in UK and have a concern relating to RSGB or UKEICC contesting, contact Jonathan, GØDVJ. We are active contesters and may not respond just before and during a contest. I cannot help with issues involving other software, such SmartSDR, WSJT-X, and so on.
Note that only the version of SkookumLogger available on the Mac App Store is supported.