1. A method for generating a compact update package between an old version of content and a new version of content, comprising: (i) generating a conversion element associated with said old version and new version; (ii) generating a modified version including applying the conversion element to one of said versions; (iii) generating said compact update package; the compact update package includes said conversion element and a modified delta based on at least said modified version and the version other than said one version stipulated in (ii).