You can't.
Searching “Internet Explorer for Mac” on Google might have brought up a few websites claiming to deliver the Windows 10 browser on your Mac.Spoiler alert. It’s a sham. Most of the people in world using Windows OS but have preinstalled Internet Explorer. This is not so fast internet browser but it is decent & it got 7th position for its popularity only. It is developed by Microsoft Software Company. News is their Microsoft working on new web browser called Spartan which may replace IE. But IE become nice after.
MS stopped support in 2005 for Internet Explorer.
If you were running a virtual machine with Windows could you download Explorer for your Mac.
If you are looking for browsers for the Mac besides Safari, consider Firefox, Brave, Opera, or Sea Monkey.
I just searched and saw this article, it might be of help
Internet Explorer For Mac 2018
Download Internet Explorer Version 11 For Mac
If you are trying to reach a particular website that calls for IE, go into Preferences in Safari, go to Develop menu, select User Agent and select Internet Explorer 11. See if the website that you are trying to reach handles that.