Antitheft app with personal name disappeared - no setup/reinstall possible

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After the installation of the installer-app the freshly downloaded antitheft app came with a personalized name and told me to do some kind of back up so it would survive a hard reset. I wasn't sure if my device (galaxy young) had a nand protection, so i left the menu to finish the set up later.

Now i cannot do anything! I do not find the app anywhere (only in the systems app list where i cannot uninstall it) and cannot finish the set up. Just before it was listed in the apps menu - suddenly it is gone!

The antitheft installer tells me "This device is already protected" and refuses service. 
My online avast account tells me "You don't have any devices connected to your Account yet." 

What can i do to complete setup? Or at least uninstall (galaxy young has not much internal storage)? Please help me.

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Same to me :-(
I have installed the root AntiTheft and rebooted.

Now no icon, no app :-(
I don't find it in Titanium Backup with my given name and can start it.

If I start the AntiTheft root again it will be again downloaded and installed.

In Mobile Security if I try to install the "non root" version I get it is installed but not "registered".
If I try to uninstall within Mobile Security I get "it is not installed".

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Enter your Avast PIN as you would dial a number.

You should be able to solve your problems then.