Hey @Arkturus_ ,
There's never any guarantee a game will / won't run on certain hardware, so we cannot confirm why it may have worked previously, however as your system is under spec, there's little we can do beyond the troubleshooting steps provided to improve performance.
As updates are pushed, under spec machines that may have worked previously, may struggle with newer builds of the game. But as they're under spec to begin with, I'm afriad we cannot guarantee compatibility.
If there's anything further we can answer, please let us know!