Random Talking Bush's Model Importers, QuickBMS and Python Scripts

[Demonslayerx8]

for update files, you would need to own the update on the switch and get the data urself and then use HACTool to get the romfs and extract files from it, it's what had to be done with the FEW DLC (actually had to buy the DLC just to get the models as they're not included in the update)

so you'll have to ask some1 that can dump games from their switch, and if they have the game, ask them to grab the free DLC data.