Although the version number in the Get Info of the installed Indigo client is 5.1.5, About Indigo shows 5.1.4, and it prompts me to download an update when I launch it.

Did you reboot after the install? Sometimes the older server doesn't get stopped correctly by the installer. A reboot will guarantee that the new server starts up.

I am specifically talking about the client app, not the server. Rebooting won't affect that.

So in the About window is shows the server version to be 5.1.5 and the client to be 5.1.4? Did you move the the Indigo 5 app somewhere else? When the installer runs it always installs into /Applications. And are you running the client and server on the same Mac?

I just ran the installer again and it's installing the right client.

Argh. My mistake. I didn't see that the "Server Version" is listed separately from the "Client Version". I thought that the alert about a new version referred to the client. Yes, the client is now 5.1.5, but I hadn't updated the server yet.

Sorry about the confusion.