More eye candy, TTS pro, some would say more "interesting routing" needs 128MB ram to run with all the options, although some 64MB devices are ok, there are plenty of primo threads with screen shots to look at.
Primo is designed to work on wince devices (4.2, 5, or 6) preferably with 128 mb ram, but works on 64 mb wince devices. For TTS, Nuance will work only on wince 5 or 6, not on wince 4.2.
Since you say you have already downloaded primo, why don't you just try it and get over it?