Cannot open offline player 1.4.11-p9 on High Sierra

I’m trying to install 1.4.11-p9 on and old MacAir running MacOS 10.13.6. When I try to launch the app, I get a popup saying “Syrinscape Fantasy Player quit unexpectedly.”

It’s an old player on an old OS, but I can’t find info in the Forum. Anyone have any ideas?

(Fuller context: the player I had installed had previously been working fine, but I got a popup saying a new version is available and, like a moron, I updated it. Now I can’t get the old player to work.)