Hi everybody! Ive done some extensive testing trying to figure out just how to fix this issue, from D3D adapters to localisation language packs but in the end the only thing that would fix it (it being the game just closing without any error message or crashlog on bootup) after this latest patch -
Go into 'apps' in win10 settings, find state of decay in the list, select 'Move' and choose another drive (or partition of the same drive like I did, tested both, either works). Once its done, boot up the game, should work. Itll create all the updated settings and configurations which you can then use to move it back to your primary drive and hey presto, were back in.
Honestly though this shouldn't even be something we have to deal with but for the time being, this SHOULD work for most of you.