I'm not very good at keeping track of the updates I have installed so far. The other day I installed PSA_ovip-int-firmware-version_42-03-31-32_NAC-r0_NAC_EUR_WAVE4, I know that because I downloaded it with the Peugeot Update app but I also downloaded it from mypeugeot.fr should the app download fail (has happened...). The app deletes the downloaded files once the USB stick is created and I don't remember the filenames. It was only a system update, no new maps, 6 GB. I do think the first one or two updates I installed were wave3, then apparently it switched to wave4. I remember that map version numbers also changed when the system changed to wave4, the current maps are version 9.0.0-something dated march 2021, I think, the wave3 maps were version 12.0.0-something dated january 2021 or so. I have no idea what the difference between wave3 and wave4 might be. My guess is that if Peugeot Update app or mypeugeot.fr selects a file for your car it is probably the correct one. I prefer the app as it does all the work preparing the USB stick correctly, which is a bit of a hassle otherwise particularly when using a Mac that keeps putting hidden files on anything that comes near.