Why hello there

I'm gonna be short here because you wouldn't be using CurseForge if you don't know how it actually looks. After you download/install CurseForge and login to your minecraft account. You can search up modpack in Modpack section by the name "NyxSMP - Season 9" and it will show up.

If it doesn't show up for some odd reason you can download it from this link:
https://legacy.curseforge.com/minecraft/modpacks/nyxsmp-season-9
Click "Files" then click "Install with Curseforge" you will proceed to CurseForge launcher where your modpack will be installed.

Click play and enjoy the NyxSMP World!