For official DynamoRIO packages, see Releases. For more recent bug fixes and features prior to the next official release, we have a weekly package built and posted as a GitHub Release with the tag prefix cronbuild-:

https://github.com/DynamoRIO/dynamorio/releases

Please note that these weekly cronbuilds are not quite the same as an official release package: they do not include Dr. Memory, and for Linux i686 is separated from x86_64 rather than being combined in one package.