As Ulrich mentions, at least one instance of Enterprise Dashboard must be installed somewhere on your network, and accessible by all registry systems installed later.
when u install the Dashboard, (select New dashboard from the install menu) you will be prompted for the devtest.lic file
Later when installing another system with Registry (part of Server install), you will again be prompted.. you then select use Existing, and point to the RUNNING Enterprise Dashboard previously installed.
this connection will verify the license for this (and any other ) Registry. This connection is not tested until the Registry server runtime is started, but the value is written into the lisa.properties file