Q: Can reunion work on old mac titanium?

According to their web site:

http://www.leisterpro.com/doc/version10/requirements.php

it can run on a Powerbook but the required minimum OS level is 10.5; you are  at 10.4.

Also ONLY get the demo from the publisher's site:

http://www.leisterpro.com/doc/demo/demo.php

When googling this I saw it offered on several sites known to bundle malware/adware with their downloads without telling you.

There are older versions of Reunion out there.  But the data format may have been updated to take advantages of new features of the new operating systems.

I remember having a customer with a 68k Mac with Reunion.  Yes, that Mac was running Mac OS 7.6 from 1997.

You may luck out and find it at a used software store, or find someone at a Mac usergroup who has the older version:

http://www.apple.com/usergroups/

Bret, I have an older version of Reunion that I used on my G4's. I'll be offering this on LEM swap site if you're interested.