i host two supertuxkart server
stkce is my mod which is required to play on server
you can downalod it herein zip file you have two xml files and karts in karts folder
i recommend applying mod to new stk installtion and don't touch your current
probably mod wont do anything bad when you'll play on normal server but just in
case or do like you want
go to root of your stk installation and in it you'll find data folder go to
it
put to root of data two xml files then folders from karts folder located in zip
put to karts folder in data folder
yes a lot of folders indeeded