Usually AEMPro detects an older firmware version and makes you update it. If it is not doing that, you're probably on the latest version (1.19).
Your first order of business is to load a base calibration on there. One for a FWD Nissan SR20 engine with MAP sensor. I assume you're using the MAP sensor?
This is accomplished in AEMPro by going to the File menu, and choosing to load a new calibration. You should get a folder navigation screen, and you should navigate to something like this C:\Program Files\AEMPro\calibrations\nissan and you should see a bunch of calibrations to choose from. Pick one that looks appropriate.
If you can't get that far, let us know.
Once you load an appropriate base calibration, there is a little work to do since you've installed the AEM CAS disc. You'll have to change a couple settings in the ignition setup as outlined by the MS Word document(s) Brent linked above.
Last edited by BenFenner
on 2012-01-30
at 19-13-34.