I’m still using the ADNM in my environment, where would I find information to upgrade ABP.
I think you must uninstall ADNM cosole than install ABP.
You can find some information to install ABP here
https://support.avast.com/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=992&nav=0,1,23,654
and here
http://files.avast.com/files/documentation/quick-start-guide-business-protection-en-ww.pdf
http://files.avast.com/files/documentation/business-protection-plus-administrators-guide.pdf
there is no upgrade from ADNM to ABP(Plus) for the consoles…
the server part (console) has to be installed fresh
the client installations can be upgraded by deploying the new client to the machines, the installer should take care of the rest.