I'm on Opus 12.25 and the Advanced Rename dialog-box is suddenly gone. When I press the Rename button I just get a dialog box with old & new name text-box. I tried to bind to "Advanced Rename" and I get the same.
I tried the fix described in another post, and it does work. Select "Use Simple Rename" and it enables "Advanced Rename".
I can't see this as anything more than a bug. Since it was reported back in 2019, it's a bit silly it hasn't been fixed up to now. It would be nice if this feature would dissappear in the next release.