[ubuntu] Why is APTonCD incompatible with quantal?

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http://ubuntuforums.org – I recently found out about the app APTonCD and became hugely excited! It could take the packages of my choice in my precise desktop and pack them all in one cd, like my "essentials" installation media. I installed this app and placed my favorite packages into a cd. Next, I wanted to insert the cd on my laptop running Ubuntu quantal daily build. I navigated to the APTonCd page on the software center, and to my dismay, I realized that it was incompatible with quantal. Why can some apps, like this one, be incompatible in quantal? Thanks. Attach (Hardware)