Is there a limit to the number of CD downloads. Can I download both on my desktop and laptop

You can download it to multiple computers that you have. Be aware that you have to use something like a flashdrive to move any changes from one computer to the other so you do not make a mess of your return. 

And no matter how many computers you download the program to you are still limited to 5 efiled federal returns per the IRS regulations.  If you complete more returns they must be mailed in.

thanks