The confusion comes from the fact that the instructions you were reading are for the silent installation of avast PROFESSIONAL Edition (i.e. the unmanaged version). For the managed version (used in conjunction with ADNM) you don't really have to mess with any files, shared folders etc etc.
Simply open the ADNM console, create an installation package (you can accept the defaults in the wizard), then create a deployment task for this installation package and run it on the clients.
I'd suggest reading the 1-2-3-4-5 instructions displayed when you start the console, it won't take you more than 5 minutes and should give you quite a good idea on how to do this.
Thanks
Vlk