Not sure I can help much as I have no experience with the Steam version of the game. If I were in your position, I'd uninstall SH5 and the UBI launcher and do a complete reinstall. If it didn't work then, I think I'd be calling Steam Support and asking for a refund.
Sorry I couldn't help more!
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System specs:
Gigabyte Z270X-Ultra + i5-7600k, 32Gig DDR-IV, Nvidia 1080TI
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