Place the folder in your Bannerlord Mods folder.
Does not replace anything so it should be save game compatible.
You can buy tem in the towns but it has the same spawn rate as other items so it could take some time until you find it in a settlement.

Place the folder in your Bannerlord Mods folder.
Does not replace anything so it should be save game compatible.
You can only get this bow through cheats in the dev console or a different editor see the main page for links.