Super strange. I am not sure what is the package this installer is conflicting with. Go to Settings/Apps and see if you can find Amethyst there.
Amethyst is not installed, Amber and Obtainium are, but I have nothing added on Obtainium
Strange. Which phone, OS are you using? It's almost as if the OS didn't remove the app entirely. I am not sure what to do. :(
Samsung s23, android
And now you cannot install Amethyst from anywhere? Or is it just through the APK that is the problem?