A (less than) comprehensive guide to downloading this mod (it might still be difficult)
1. Download Halo Custom Edition from archive.org here and activate it by using PGQTG-4X4J3-68M87-B28TR-J2CBJ Archive.org Custom Edition.zip
if this link does not work look up halo custom edition on google and use the internet archive
2. Once everything is downloaded onto your pc download and apply the Halo CE patch found here: Archive.org
if this link does not work look up halo custom edition patch on google and use the internet archive
3. Download and apply AmaiSosu V0.4.0 to your version of Halo CE, found here: Github.com
3. Place the most recent version of the mod campaigns in the map folder alongside the campaign and multiplayer map files
4. Make a shortcut of the executable and then open up the properties of the shortcut and type in -devmode -console in the target area
5. Once on the menu press the tilde key and type map_name then the name of the campaign you wish to start
6. If it does not work be sure to start fresh and try again, you might have done something wrong by accident
7. If you downloaded everything alright and enjoyed the mod, be sure to leave a positive review!! Always helps :)