Redactor 1.x was our original implementation of Redactor. In September 2015 we released Redactor 2.0 as a free upgrade. Redactor 1 is no longer officially supported following the release of Redactor 2. The latest Redactor documentation can be found here.
The Redactor 1.x documentation is archived in this section. Check our notes when upgrading from Redactor 1.x to 2.0