concrete5 126.96.36.199 contains a lot more than 188.8.131.52, and is highly recommended for anyone running 5.7. (Note: 184.108.40.206 was pulled because of an installation bug, which is fixed in 220.127.116.11.) It fixes a lot of bugs, tightens up the editing experience and the editing styles, and adds some new debug and developer functionality. Add-on and theme developers are highly encouraged to use this release for their work.
Want to get up to speed? Check out all the things that are new with concrete5 version 7: