This bug was originally posted by Richard Lovison, in the post "Help issue with the Plus version". It did not receive any developer attention. I am re-posting the issue here under a more descriptive topic name.
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This appears to be a bug with SkySafari Plus and Pro, v6.5.0.1 running under iOS 9.3.5 on the iPad 2.
The SkySafari Help System crashes to the iOS home screen when the user taps on most any of the selections.
Some selections will display the next help page, but then crashes when a further item is selected.
The bug was reported by Richard Lovison on July 31, 2019 and reproduced by myself using the same iPad model and iOS version.
See the attached image for my own findings.