Just do exactly what you did with the game's files. The update has both dt and ls, so extract them normally then put them in some folder or merge them with the games files to have all the files in one place
What tool did you used to rip the 1.1.5 update?
And what tool did you used to extract and then rebuild the update?
I used Asias81's tool to mod the music, but I really want to change the update to remove the pac man song included there. (As well as get custom music on the DLC stages)