Unlike standard user apps, Google Account Manager does not have a launchable icon in the app drawer. It operates entirely in the background.
Never install a version higher than your Android API level. For error 601, users often need version 4.4.4 (for KitKat) or 5.1 (for Lollipop). Check your Android version in Settings > About Phone . android google account manager 601 link
If you are using this APK to fix login issues like "Your account wasn't added", try these steps: Google Help Check Date & Time Unlike standard user apps, Google Account Manager does