Yes, it is allowed but only with attribution. 

If you want to use footage from this archive for free, you need to attribute freestockfootagearchive.com in your work – that’s fair, right?

You can find all details about the license here:
Attribution 4.0 International (CC BY 4.0)

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You can keep what you downloaded – forever.
Use one video for as many projects as you want.
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