You would need to change your deployment to an LWAPP Model using the WLC (Wireless Lan Controller) and upgrade your 1242 AP's to LWAPP (Lightweight) as well. This is very possible so your investment is not lost here;
You will need the WCS, LocApp 2700 and the WLC and everything running on LWAPP.
However I would strongly advise that you get a proper survy done as the AP locations almost definitly need changing to give and respectable location resolution. You need the location devices to triangulate to between 3 and 8 Aps at -75dBm. Also the mapsetc plus fingerprinting.
I installed alocation device when they first came out and have done many location surveys. You will probably need more aps aswell