OK, looks like I'm getting somewhere, and overcoming my ignorance "one app at a time."
Although ES File Manager does not find ANY APK nor APX files, I do see the apps, and now can use Easy Installer to re-install an app. Once I figure out how I did it (I was concentrating on trying to extract something....), I'll do it some more.
Sorry, APX was a typo. APK however was correct.
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