How to install the euphoria mod into your game

Use the OIV or manual. For manual:

for update.rpf's physictask file, navigate to mods/update/update.rpf/x64/data/tune and paste the physictasks.ymt file there.
for x64a's physictask file, head over to mods/x64a/data/tune and export the physictask.ymt file there.
for NaturalMotion folder files, go to mods/common.rpf/data/naturalmotion and export the rest of the content from NaturalMotion to your NaturalMotion folder
for the weapons.meta files, put the weapons.meta to mods/update/update.rpf/common/data/ai. With the rest, just drag the contents from the dlc_patch folder to your mods/update/update.rpf/dlc_patch folder. Make sure to put weapons_heavyrifle.meta to the according location which is "mods/update/x64/dlcpacks/mpsecurity/dlc.rpf/common/data/ai

Have Fun!