The string you need is: --user_data_location="path"
In FM16 they have fore some strange reason removed the option to change the folder and drive on your computer where games is saved and where you put any external graphic that you might wanna use like Facepacks and logopacks.
You can still change it from outside the game, watch this tutorial to learn how.
For other Football Manager 2016 tutorials check out my channel:
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And for some live FM16 check out my stream:
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