Here's how I understand it:
TRS2007 is the French edition of TRS2006 with SP1, which is sold as a separate product at full price. It is the only method by which owners of the French edition of TRS2006 can upgrade to SP1. For all other language editions of TRS2006 for which SP1 is currently available, the upgrade can be downloaded free of charge. This situation arose due to the policy of the French edition's distribution company.
TRS2007 is also the working title of the German edition of TRS2006 with SP1, which is currently in development. In this case, the SP1 upgrade will be provided to owners of the German edition of TRS2006 (called Pro Train Perfect, or PTP) for a nominal charge.
John