SHIELD TV: "arm64-v8a" or "armeabi-v7a" download core folder

Hi, could you confirm me the right folder to choose between “arm64-v8a” and “armeabi-v7” a in order to manually download an android core for the shield TV on the site ? thanks for you advice regards.

ah ok thanks.I have used the playstore so thank you. and v8 is for nighties apk of the site ?

ok thanks for the explaination regards