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I'm surprised it ever worked! If this happened after a game update you could try reverting to the previous version taht worked, in the Steam Betas tab for this game.
Otherwise, I hope you have access to a machine with supported hardware:
Processor: Intel® Core™ i3-3250 or AMD® FX 8370 (AVX support required)
Memory: 8 GB RAM
Graphics: Nvidia® GeForce™ GTX 660 (2GB) or AMD® R7 370 (2GB) or Intel® HD Graphics 630 or AMD Radeon™ Vega 8