We have a StudioLive 24.4.2AI and I built a new PC with a dual FireWire card. Using Capture (free from PreSonus) I can record any (or all) tracks from the board (dry - after the input preamp, but before fader, effects etc.) I find it works very well.
From your My.PreSonus page you can download software for your registered products.
The StudioLiveAI mixers include two software programs
1) Universal Control v22.214.171.124460 for Windows - drivers to access the mixer via FireWire
2) Capture 3 for Windows Version 126.96.36.199460 - software to access / record all channels from the mixer