Even if this driver is installed it might not work as expected. Does this device contain its own GPU? If not, then it will fail to find the integrated GPU (iGPU), and the manufacturer would likely need customization to use it with the iGPU. Most systems use a discrete GPU (dGPU) on the PCI bus, which allows a standardized PCI access interface. iGPUs do not respond to that interface.
Since the software wants at least kernel 4.15, I am wondering if this missing driver is also for PCI GPU devices. Odds are that if you get the 4.15 driver back-ported that it will still fail.
Does the manufacturer provide this driver in source code format? I think this will fail, but it might work if you have source code.