1.What Launcher are you using to setup RLCraft, Twitch or Vanilla? If you got it from Curseforge it's recommended/required to use Twitch to install. Modpacks aren't installed in the Vanilla/Mojang/Regular launcher.
2.If you look in the files and see a manifest, modlist and override files then even more reason to use the Twitch launcher, it will unpack and download/install everything for you. The only time you will get mods easily with a folder is if a friend makes one and sends it to you, all modpacks need to be unpacked by Modpack Launchers (Twitch, Technic, FTB, AT, or launchers like MultiMC).
3.Can you show screenshots of the folders/launcher so I can get an idea of the issue.
4.Any info or evidence would be helpful, like does it crash when loading, the download of the pack was unsuccessful or anything.
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