if you want the google play version with auto-translate, then get: https://github.com/vitorpamplona/amethyst/releases/download/v0.42.5/amethyst-googleplay-universal-v0.42.5.apk

If you want fully FOSS without google spyware but without auto-translate get: https://github.com/vitorpamplona/amethyst/releases/download/v0.42.5/amethyst-fdroid-universal-v0.42.5.apk

i recommend the FOSS fdrpid version 💜