This solution works for me.
Mac running OS X 10.13.1 for Pod Studio GX
Uninstall drivers using Line6 Uninstaller.
Open System Preferences\Security & Privacy
Install driver from package. Don't install from Monkey as it wouldn't work for me.
As soon as installer launches, Security & Privacy will pop up that "package can't be verified" or something... Just approve it.
Restart. Works just fine.