FIRST OF ALL DOWNLOAD OPEN IV https://www.gta5-mods.com/tools/openiv

1. Open the 'OpenIV', turn on edit mode
2. Navigate to GTA V/mods/update/update.rpf/common/data/effects
   and put explosionfx.dat and decals.dat from the archive
3. Navigate to GTA V/mods/update/update.rpf/x64/data/metadata
   and put explosion.ymt from the archive
4. In game Use Rocket launcher to use this mod.