I assume you got 1.1.110 on steam through the Betas branch. Could you try turning on and then turn off the "Factorio: Space Age" on the DLC page?

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Re-enabling and disabling the DLC worked after reinstalling the game. Really weird and unintuitive behaviour. Must be an issue on steam's ...

I want to continue working on my 1.0 save until every mod gets ported to 2.0, however Steam doesn't downgrade to 1.0. When selecting 1.1.110 in the "Beta" menu in steam, it starts downloading but somehow the latest version stays the same.

OS info (provided by steam):

Computer Information ...