The 1.4.x branch of PrestaShop is one of the previous major version branches of PrestaShop, first released as a stable version in March 2011.
It has been superseded by version branch 1.5.x in September 2012, and branch 1.It's 6.x in April 2014.
Its last version is v1.4.11.01, released in June 2013July 2015. There will not be any more updates.
If you are still using version branch 1.4, you should upgrade to the latest versionbranch!
Documentation for PrestaShop 1.4.x