Preferences

Trust Accounts needs to know where the Central programs are located. This path is set up in Preferences > Local Options > Links > AP … The screen is as follows:

Tick the option Accounts Production, click button AP… and browse to the location of ClientFramework.exe, which is the executable program for CCH Central.
This needs to be done on each workstation that uses Trust Accounts because, at least in theory, each workstation could have the Central programs installed in a different location.