If the ACMP Agent cannot be distributed in a work group environment via the ACMP Console, this maybe the result of a security Windows feature i.e. "User Account Control". In the past, Microsoft has denied the local administrator access via the network for example for "admin $“which is needed by ACMP for the distribution. This also applies to the remote computer management or the remote registry.
In this case, you can either follow this instruction guide: https://recover-keys.com/kb/disable-uac.html
Or alternatively, you can manually install the agent on clients from the ACMP release of the ACMP server. Subsequently, the ACMP Agent works exactly the same as the distribution from the ACMP Console.