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I have Windows 10, FTG through steam. Game doesn't save, just ctd.

Any tips on how to fix this?

The vanilla game of FtG or did you start with a mod like AGCEEP?

Did you read and adhere to
https://forum.paradoxplaza.com/forum/index.php?threads/tech-support-faq.444126/
e.g. not installing in C:\Programs...
and checking that you actually have a Save games folder, depending where you installed your game e.g.
G:\Paradox\For the Glory\Scenarios\Save Games for the main game and
G:\Paradox\For the Glory\Mods\AGCEEP\Scenarios\Save Games for AGCEEP