Also, you should consider installing the Skyrim Script Extender (SKSE) available on Steam for free to efficiently utilize the mods that support it. In either case, if you download the mods from Bethesda’s official site, you should read the procedure as stated in their official support portal. Majestic Mountains have caused issues with overly shiny rocks in the past. In case you have a console (Xbox One or PS4), you simply need to add the mods from Bethesda’s library. For instance, if you download a Skyrim mod from Nexus mods, you need to follow their official guide to install the Skyrim mods manually. Cloaks of Skyrim SSE + USSEP Patch (Select in the installer) Real Mountains or Northfires Photoreal Mountains 2 for SE or Majestic Mountains (I usually use BOTH Real Mountains and Northfire’s Photoreal Mountains 2, in that order, to get the best of both worlds. It usually differs depending on the portal you download it from (for PC). There isn’t any single solution to install a Skyrim mod. Surreal Lighting How to Install Skyrim Mods?