I think you need to uninstall and reinstall from the store. There is something funny happening with this upgrade path you mention

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I uninstalled then installed clean from play store

Go to App/Settings, select Amethyst and clear storage.

The Store has a different signing key than the APK. The encrypted storage doesn't open if that is the case :)

Settings/Apps/Amethyst.

still not working I'm afraid

Are you able to insert your private keys or not even that part?

No, the logo just comes up then it crashes

Yep that feels like it's the local cache. Did you also try to clear it?