Question about paid to download(or install)

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i have never done anything like this before and it sounds like something i may be interested in doing, i just haven't really ever figured out what it means or how to do it, does anyone know anythign about this and if you do, how do you get paid and what is the average that you get paid and what do you have to do? does anyone know any good websites that will let you do this...if you do please let me know and i will join under it!