How do I copy old save data to my new Deus Ex installation?

How do I copy old save data to my new Deus Ex installation? - Collection of vintage audio cassettes on table

You know how Steam lets you transfer game saves to a USB stick?
About 5 months ago my PC hard drive got messed up so it had to be replaced, and before that happened, I had saved data from Deus Ex onto my USB stick.
Now, how do I transfer the data on the USB stick to my new hard drive, so it can be found by Deus Ex?

steam deus-ex

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Fixing saving file problem in Deus Ex: Mankind Divided

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