Can I install dlcs with the wup installer? If so how should I put them on my SD card what should the folder be name? So far I manage to install games and updates

You need rednand to install dlc.
You can use sysnand but that is hard to do and isn't safe for most users.
Yeah but its annoying because sigs need to be patched even if the game is legit after installing dlc.It's not exactly hard. There's a fw.bin that patches signature checks on sysNAND. Which you can grab from FIX94's github. Or you can be lazy and grab the full package from "That iso site" As long as you're installing game content in your region such as VC, DLC, games, etc... The risk is minimum.

Yeah but its annoying because sigs need to be patched even if the game is legit after installing dlc.