Replace download button image with a new image - current image is not available on 10.10

[JK3Y]

I think this one may be it https://www.flaticon.com/free-icon/down-arrow_3490#term=download&page=3&position=81

filled back w/ white arrow: https://www.flaticon.com/free-icon/download-down-arrow-circular-signal_51689#term=download&page=9&position=67

https://www.flaticon.com/free-icon/download-arrow-button_9261#term=download&page=6&position=23