Both Forza Horizon 4 and Horizon 3 demos crash to desktop without error

I have tried the forza horizon 3 demo 3 times and all times it shows the grey window with the logo, then the window turns black, the msi afterburner osd shows up with the fps counter and then nothing it freezes after 2 seconds and the window closes itself without error. So when the new Forza Horizon 4 demo showed up I thought I should try it, maybe since forza horizon 3 was a bad port that might be the problem, but no, it does exactly the same thing as forza horizon 3.

Mind you I have bought Forza 7 and downloaded Forza 6 Apex from the windows store and they both work fine.

My specs:
Windows 10 64bit updated to the latest patch
Intel i7 2600k
16gb DDR3 HyperX
AMD RX480 with latest drivers

I really don’t know what to do to try these demos, I already did a clean boot, reset the apps multiple times, tried it in offline mode, disabled and even uninstalled my firewall and antivirus, downloaded another tiny app then tried to start the demos. Nothing works.

Same as me, as i write in my topic here https://forums.forza.net/turn10_postst131954_forza-horizon-4-demo-cannot-pass-splashscreen-logo.aspx , both demos of fh3 and fh4 crash at splashscreen logo, other games demo working normally, i’ve buyed forza motorsport 7 and is working , i tried download from the store the demo of fm7 and working, only forza horizon 3-4 not working

I fixed it by doing what this guy https://forums.forza.net/turn10_postst132062_Game-does-not-start--You-have-COMODO----Solution-here.aspx said and it works since I have COMODO installed, I tried disabling COMODO but it still blocks shell code injections. Anyway after doing what that guy said it starts up, loads the menu and stuff, and then it crashes at random times, like when optimizing the game then again crashed after it optimized during the loading.

Ok I give up, this is the 5th time it crashed during loading the first game and MSI Afterburner is telling me the game uses all of my ram ALL OF IT like I barely use 3 - 4 gb of RAM during normal use and as soon as the game starts to load the map bam 15gb used. I wanted to try the demo before buying the game but I guess I’ll stick with something else like F1 2018.