How can I download the 3400 x keypad manager app?

I’m trying to install the Iris keypad but researching about how to install it is telling me to download the 3400 x keypad manager app to be able to use it. I’ve been unsuccessful trying to find it. can anyone give me a hand how to set up my keypad?

You should start here:

Thanks, but I’m new to this. I’ll need a more detailed instructions on how I put the centralite 3400 app on my ST system.
Please if someone can explain the process kind of a Smartthings for dummies type instructions will be greatly appreciated. everything since the beginning. thanks Guys!!!

Not a problem @Pitomostro2,

You should take a look at this community created Wiki on getting started, apps and more: