ipMIDI v1.6 for Mac and v1.9 for Windows have recently been released: You can download them here:
v1.6 for Mac
Supports Snow Leopard (10.6) and Lion (10.7). Install this over the top of your current ipMIDI softare and settings are retained. This has been testsed and certified by SSL.
If you are running Leopard (10.5) then you should use v1.5 which is available at the above link.
v1.9 for Windows
To update to this version you must first uninstall the current ipMIDI software. Once this is done you can install v1.9. However, as you are unisntalling the previous version first, all your ipMIDI settings are lost and v1.9 will default to only 1 MIDI port. You will need to re-configure ipMIDI accordingly depending on which SSL console you have. Please refer to the appropriate SSL user guide for this.