Cannot update PSE 2019 OSX

"There is no application set to open the URL auphd://update?sapCode=PSE&baseVersion=17.0&platform=osx10-64&skipUpdateInfo=true."
^Dialogue that comes up when trying to update or quit PSE editor.
Downloaded version of PSE 2019 OS X.
Changing default browser to Safari/Opera/Firefox/Chrome doesn't change anything.
Turning off any/all extensions on all of those browsers doesn't change anything.
Obviously, "Choose Application..." and "Search App Store" are not a solution.
OSX 10.13.6, latest versions of all browsers.

