Place these to designated locations;

FGM148Javelin_Replace	>>	mods\update\x64\dlcpacks

		and
		
weaponhominglauncher.meta	>>	mods\update\update.rpf\dlc_patch\mpchristmas2\common\data\ai


Then edit the dlclist.xml in mods\update\update.rpf\common\data;

		<Item>dlcpacks:/FGM148Javelin_Replace/</Item>

Surprised you can install Replace version as a dlcpack too instead of copying the entire vanilla dlcpack?