Middle Age Crisis ,CBM1.94+Assimilation mod 1.1 6/8 Players Remaining

[Smeghead]

Yes, I'm leaving the original file in place; just copying it to a new file.
Oddly, no matter what I call the second file, two identical options "Assimilation - Mid" then appear in the mod preferences screen.

[Sluagh]

My dominions 3 mods folder contains the Assimilation folder, a (probably useless) Assimilation - Late.dm file, and a file I renamed to Assimilation_Mid.dm.

If you're saying that you have both Assimilation - Mid.dm and Assimilation_Mid.dm it probably means it's only 'seeing' the first one.