How to download file using Powershell Script?

[oemript]

Referring to following attached image and given link, I would like to know on how to code Powershell Script to download those files.  There is no direct link to be copied.

https://www.hkex.com.hk/Market-Data/Futures-and-Options-Prices/Equity-Index/Hang-Seng-Index-Futures-and-Options?sc_lang=en#&product=HSI

Does anyone have any suggestions?
Thanks in advance for any suggestions

Edited November 24, 2017 by oemript

[oemript]

Referring to following attached image and given link, There is a that.exportFutures() function to download file, I would like to know on how to code Powershell Script to download those files. 

function() {
  that._exportFutures();
}
https://www.hkex.com.hk/Market-Data/Futures-and-Options-Prices/Equity-Index/Hang-Seng-Index-Futures-and-Options?sc_lang=en#&product=HSI

Does anyone have any suggestions?
Thanks in advance for any suggestions

[JLogan3o13]

@oemript stick to one topic please