Updated WoW today, most things pushed in a new "_retail_" directory.

Yes, I've been a bad WoW player, off playing other things.

I'm wanting to log in to retrieve my xmas presents before tomorrow.

I've updated IS/ISBoxer for the DX12 update.

I've updated my WoW directories, and now each of them has a _retail_ directory with most stuff moved into it.

When I run ISBox, it says "wow.exe cannot be found". Not a shocker.

Is the _retail_ directory a thing now? Should I update my ISBoxer settings to include /_retail_/ in the path, or move the files back, instead?

Yes, change the directory. One of my machines updated on its own and the other I had to manually change the IS configuration.