alpine cda 8933 and audiovox xmdirect2 c

I have an Alpine CDA-9833 XM ready head unit and recently purchased an Audiovox XMDirect² (CMP2000UC) XM radio adaptor. Before installation the adaptor must have the proper radio model download. The program is downloaded from the Audiovox website and must be selected from a list of Alpine model numbers. Well the CDA-9833 is not on that list. The closet model number is CDA-9853. I called Audiovox and the technician told me that that model had not been tested yet and all he could tell me is that it would not work. I feel he was telling me was the company line was that it would not work but it could possibly work but has not been tested for that model yet. Has anyone had any experience with this set up? Does anyone know if the CDA-9853 download will work with the CDA-9833?

Thanks,

Focal61