for ids in id_list:
    my_asset = client.get_assets_by_id('PSScene4Band', ids).get()
    client.activate(my_asset['analytic'])
    my_asset = client.get_assets_by_id('PSScene4Band', ids).get()
    callback = api.write_to_file('**dir**')
    body = client.download(my_asset['analytic'], callback=callback)
    body.await()
    time.sleep(30)