Hi, just played H4 for the first time in a long time, and was really happy to see a hopper with specific weapons placed on the map, no ordinance drop.
Is there anywhere I can download these maps? Is there one of this type available for every map, or only those in Legendary Slayer?
Thanks for your time.
To be able to play these maps in Customs, you will need to go into your Temporary History and download them as map types, or reach into 343 Industries’s File Share and grab them from there 
You should also make sure you’ve got the Legendary Slayer gametype, which can be obtained through the same method.
I’m not sure about those, but go to the Classic Map Remakes Halo 4 thread in Community Creations for map remakes with classic weapon spawns like you described.