RFA/Java 7.6.0 adds support for this but the ValueAdd DomainRep library was not kept in sync and still not supported in version 8.0.1.
Dictionary Download from an ADH ------------------------------- Publishing application can now request the dictionary from the ADH. This provides a central location for publishers to obtain the dictionary. (This functionality requires ADH 2.6 or newer)
To clarify, the following file:
package com.thomsonreuters.rfa.valueadd.domainrep.rdm.login;
Does not include SupportProviderDictionaryDownload as required to determine support for ADH dictionary download. That file should match all the attributes listed in the RDM Usage Guide for Login Refresh Elements.