AntiTheft - Root Method

If I try to install AntiTheft with root the installation works fine and I get afterwards a message to reboot my phone.
After reboot there is no icon or anything else.
Only the AntiTheft icon. If I start it again I can again install it !?

So what did I wrong?

Using Nxeus 5X rooted with Android 6.0!

You will need AMS-5 (or the 5 beta) for it to work on Android 6.

Thanks, but where do I get the AMS5 or 5 beta APK?

You will need to sign up as beta tester.

https://blog.avast.com/tag/beta-test/
https://plus.google.com/communities/112394513906169233317

or wait a little bit.
Rumor says AMS 5 will be released later this month.
It will be free, including the current premium options.