The software automatically checks for updated versions.  If you would like to check manually: 

On Windows 7, go to: Start> All Programs > GenArts Sapphire OFX > Check for SapphireOFX Updates.
On Windows 8 & 10, search for GenArts Sapphire OFX > Check for SapphireOFX Updates.
On Mac, go to: /Applications/GenArtsSapphireOFX/Check for Sapphire OFX Updates.
On Linux, open a shell window, and type su to become root. Then type the following command: /usr/genarts/SapphireOFX/update-check

You can also go to http://www.genarts.com/support/downloads/sapphire/other-ofx.