Hello there! A lot of times the only time when you're able to download everything in one go is via torrents. That is if they are available and up to date of course. Majority of time you are going to have to download individual files from the original posts. They are mostly split into so much parts because some artist's works weight A TON. If they were to put everything into 1 big file then it would be impossible to even host such a big file for free or it would actually take more time for free users to download that stuff, because a lot of times, after you download like 5GB of a collection you get your download speeds reduced in Pixeldrain for example. Or in case of MegaNZ, you are unable to download for the next 5 hours if you did not pay for their subscription plan or you don't use a VPN. If you do not have paid plan anywhere, or you do not use VPN, I recommend using: Pixeldrain, WorkUpload, MixDrop, UploadHaven, TERMINAL and MediaFire to download your files from this site. When you download your stuff you may mix up your download hosts to gain some bigger speeds. Like for example, you have 20 files to download, then download 10 of them from Workupload and 10 of them from MixDrop. I'm talking about a scenario where you do not have a paid-plan on MegaNZ for example to download these files rapidly. If you do, then just download everything from MegaNZ
Also, you might want to check some posts near the end of the thread you're interested in. There are a lot of community members here that are doing upscales, sound edits, visual edits or frame interpolations (smoother looking video), compressions (suddenly something that weights 30GBs weights 4GBs) and much more. Hell, I even do some of this stuff and upload it here. You might even find that somebody actually did a torrent with every single file in it, but the original post was not updated yet to include that torrent.
Hope that helped you in some way, homie! Take care!