Your best bet would be to contact Just Trains support. They should be able to help with this kind of thing. There is a link on the website www.justtrains.net
Why where the packs retired? Will any other old packs get retired?
It was no longer compatible with the latest version of the game and it was not possible to update it. If something no longer works with a game we would certainly take it off sale.
@vittorio The instructions mention that you need to push the 2nd set of wagons into the empty Arrivals Run Around Loop, then back into the branch before attaching the 1st set to the end of the 2nd set... then you can proceed to take them all to Hope.