The adobe_oobelib.dll patch is specific to CS6. For CS5/5.5, you need different patched libraries, but the concept is identical (replace the activation DLL). The hosts file method works for any version.
: Downloading "fixed" DLL files from third-party forums carries a high risk of malware. It is always safer to use original installation media and only use patches from verified community archives. adobe cs6 offline activation fixed