[A31517] This installation of Arbortext Editor does not support the -styler command line argument.

This sounds like a problem for SDL. As a workaround, try installing Styler.

I agree with Gareth - Looks like the shortcut you're clicking on to launch Arbortext Editor is really a Styler link. That's what the error message means. To launch Styler, all you need to do is add the "-styler" to the shortcut command. And if you don't have a license for Styler, that shortcut link won't launch that way.  You either need to fix the shortcut link or get a Styler license.