Or what if I was running FMS 12.0.4 -- and didn't care about IWP -- and upgraded from 10.8.5 to 10.9 already? I'm assuming I can just uninstall 12.0.4 and install 13.0.1 (right?)
Thank you for the post.
Please review Chapter 6 of the FileMaker Server 13 Getting Started Guide.
This installation help guide is released for every version of FileMaker Server. For FileMaker Sever 13, Chapter 6 contains the instructions for "Upgrading or moving an existing installation."