Because this is official Bethesda content, you cannot (and should not) download it from third-party modding sites. Instead, use the following official methods:
At its core, Ccbgssse025-advdsgs.esm appears to be a seemingly innocuous file with a cryptic name. The ".esm" extension suggests that it might be an executable file or a script of some sort. However, the alphanumeric string preceding the extension is what has piqued the interest of many. Ccbgssse025-advdsgs.esm Download