1°)Create a VM
2°)Install Steam and Horizon
3°)Start ED to check you don't have the required update bug. If so, delete VM and repeat from start.
4°)Copy-paste Elite Dangerous folder(~150Go) in ".\steamapps\common\Elite Dangerous\Products" from the VM to the real machine in ".\steamapps\common\Elite Dangerous\Products"
2°)Install Steam and Horizon
3°)Start ED to check you don't have the required update bug. If so, delete VM and repeat from start.
4°)Copy-paste Elite Dangerous folder(~150Go) in ".\steamapps\common\Elite Dangerous\Products" from the VM to the real machine in ".\steamapps\common\Elite Dangerous\Products"