Ah. So your device is a USB to DVI-VGA adapter which uses an older generation DL-1x5 chip. You don't need this driver for it at all then, it's should be supported by "udl" module which is already available in the kernel.
All the components you need are in your hands and they are all open source, should you need to tweak stuff. Let me know if you're successful - if you find a way of running the Pi with 2 screens, we can replicate this for newer devices that need evdi and DisplayLink Manager.
Cheers,
Michal
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