Whenever I try to download with manager, I get the following error: "Firefox can't find the file at nxm://Skyrim/mods/3863/files/1000172397." Obviously, I use Mozilla Firefox and the mod used for this example was SkyUI. The same error pops up when I download any other mods. For example, Unofficial Skyrim Patch: "Firefox can't find the file at nxm://Skyrim/mods/19/files/1000177250." And Immersive Weapons: "Firefox can't find the file at nxm://Skyrim/mods/27644/files/1000023285."