I would like to use the downloaded materials after I unsubscribed, is it possible?

You can use any icons or pictures downloaded for a year starting from the first day you end your plan (as long as we decide).
Unauthorized use after the end of your plan will result in a penalty of (1) three years worth of usage fees, for corporations, or (2) five years worth of usage fees, for individuals. For more detail, check the "Term of use" carefully.(https://prezentation.co/about/terms/)