Hello there
I have the problem as statet above.
I click to launch Horizon 4, the Window with the pretty car image opens, and after about 2 seconds the window closes without any error message or other notification.
My System:
i7-7700K
GTX 970
16GB RAM
Win10 pro 64bit
My system is quite fresh without a lot of fancy stuff installed, pretty much a antivir (trendmicro), teamspeak/overwolf and needed drivers for the sytem and periphery (Steelseries and Logitech gaming).
I tried (no necessary in that order):
Updating to latest Windows version
Running the latest Nvidia driver (411.70)
Im using ad admin Account
Installing and running another windows store app
Running the tool you linked on your supportpage
Deactivated Dev-Mode
Setting Time right (and wrong, and vice versa)
I have no Rivatuner, Afterburner or similiar to deactivate
Disabled spatial Sound
Re-loaded all dlcs
Re-loaded complete game (2 times now)
Relogged store account
Restarting PC
Deactivating Trendmicro
Deactivating Geforce Experience
Deactivating Overwolf (all together)
Have no banking software installed
Have no VR-Devices or Multiple Screens
Have no streaming software
Im pretty annoyed i cant use the 4 days early access, especially with so many people around sharing this issue and and who where able to play the demo just fine.
If you need more infos feel free to ask.