this is helpful
kk, latest server on RZ = 1.7.3 so maybe downgrade a client to 1.7.3
I have never done it, this is only my opinion which may help, and this is what i would do if i had to.
elements.data is like a database with a lot of tables which are lists? in our case, every list has columns (id, name, etc). if i would downgrade one, i would see which tables/columns are available in the client i want to downgrade to. export each of them, and maybe create a script to simply such process, to remove new lists/columns. then see if all the needed columns match in types, example: a colum that requires a string to be 128 but on my target client it's 64, you would need to adjust that too, and set all the values to that value type/limit. as for tasks.data i would just load and save as another version.
aipolicy.... take the monsters, make a list of their ai ids, see the latest, delete old ones and keep only the needed aipolicies. but the thing with ai is that it depends on npcgen.data too, if you don't have it, then that's when it gets hard, you need to mimic it.
for other data files.... i don't think you need gshop files, and domain*.data files are probably the same since their release (tw, nw and cross tw)
i hope this helps
