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That sounds like an install that went bad for some reason, corrupting CC's program file. It almost certainly isn't a problem with V3.5.6, because it is running on thousands of devices.
What does Google Play say? Does it think CC is installed? If not, try installing it again.
The "nuclear option" is to uninstall and reinstall the app. Depending on how many books you have on the device, this path could be somewhat painful, but it is the easiest and most certain path forward. It would be less painful if you happened to have made a backup of CC's settings.
Google provides no option to rollback an app, so that option is out. Depending on how corrupt the current install is, you can't even sideload a previous version because Android refuses to backtrack.
One possible option: if you can "sideload" an app using its APK file, I could send you the V3.5.6 APK by email. You could then try to reinstall it over the top of the corrupted version. To do this I need an email address that will be delivered to your device. You can send me that via private message on this forum. It isn't certain that this will work. Some corruptions are cleared only with an uninstall.
To recap: the quickest and most sure way of recovering is to uninstall and reinstall CC.
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