Installation: 
Open:OpenIV (If You Don't Have It Here You Go)( http://openiv.com/ ) 
Enable Edit Mode 
Go To (C:\Program Files (x86)\Steam\steamapps\common\Grand Theft Auto V\mods\update\update.rpf\x64\data\tune) 
Then Place "physicstasks.ymt" and others There 
And You Are Done 