Hi c3d,
We have recently also upgraded our environment to platform server version 11.10.2 (build 25738) and I noticed this same behavior when clicking on 'Test Connection'. I think it is a bug.
Actually there is a newer release for the platform server which is currently on version 11.10.3.
In any case, you can just continue with the installation since your database schema already matches your installed platform server version (11.10.2). We did the same and everything went fine.
Hope this helps!
Regards,
Nordin