XNA games must be copied to 360 using the XNA game launcher. They cannot be downloaded from CD / DVD.
You can use other 360 libraries, but you need to compile them using the XBox.net libraries. Therefore, if you do not have access to the source code or if you want to decompile and change all the links to the infrastructure libraries on the Xbox, and then delete any calls that do not exist on 360, you should not try.
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