Apologies - I didn't see your post. It looks like you're sorted now anyway but fortunately I had a copy of the 10.13.0 installer on my NAS. It's not something that I consciously do (although I will now), but I had a few older base versions there which meant I could avoid any forced updates by Apple.
That said, I'm struggling with 10.13.3 so I'm going to have to find a way to live without DisplayLink that doesn't cost me too much money.
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