This version of the pack doesn't require any mods to work, but it's limited to a day and night sky only.

Works from Minecraft version 1.20.5 to 1.21.1. Be sure to enable Fabulous! graphics, otherwise the pack won't work.

Thanks to Csala Bálint for providing the template pack. https://github.com/BalintCsala/minecraft-vanilla-skybox