You can "downgrade" a packet structure if you want. It's what I made for the nobility packet when I added the function to a 5017 client. Same thing when I worked on a client before the CPs... You need to find the structure with the newest client and try to reconstruct the old one. If he can find the actual structure, he can find the old one. Sure it will be easier to work on an up to date client, but maybe it's not what he want.
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