Download the source from their github and you can run it locally.  There is no need to compile anything since it is all HTML/JavaScript code that runs in your browser. You'll likely need to change the two blockchain explorer address in the js/index.js file from "explorer.myhush.network" to "explorer.myhush.org" for it to see your balance correctly.  With that change I've run it locally and successfully sent and received HUSH.  See  github.com/MyHush/myhushwallet  for source. Hope this helps.