Oracle Application Express Release 5.1.0.00.45 was released on December 21, 2016.
The full download is available below.
Oracle Application Express 5.1 is fully supported through Oracle Support Services on all Editions (EE, SE2, SE, and SE1) of the Oracle database, 22.214.171.124 or higher with a valid Oracle Database Technical Support agreement.
Application Express 5.1 can also be used with Oracle Database 11g Express Edition (XE), but is supported only through the OTN discussion forum, and not through Oracle Support Services. For more information on upgrading Application Express within Oracle XE go here.
We support installation on the following platforms: