read the last paragraph of the link you mentioned :
This form should not be used to request an update to an existing trainer or for a different version of an existing trainer. The official trainer thread on the message board for that title is the appropriate place for those kinds of requests.
'touche, but its kind of a grey area when talking about the same game on a different client. Making a GOG version would require us to buy the GOG version, and then code a new trainer for that version, which is different than updating a trainer because a game has patched, which is what that usurp is trying to prevent (people requesting trainers for recently patched games that already have trainers)...but hey, i could be wrong >_>