APPX release history

Every APPX release from 3.2 to 6.2.1, newest first within each line, with its release notes and installation guide. The last column says what to know before moving to that release. Upgrade paths has the full steps, and Platform requirements lists the operating systems each release needs.

Current releases are on the downloads page. Dates are the ones the old website gave; "not recorded" means it gave none.

Release	Released	Release notes	Installation	Before you upgrade
APPX 6 From 5.x, upgrade from 5.4.5 or later (details). SSL needs desktop clients 5.4.4c or later (details).
6.2.1	Jan 6, 2026	6.2 features and fixes	Installation guide
6.2.0	Oct 31, 2023	6.2 features and fixes	Installation guide	The 6.2 desktop client has problems with 5.x servers; use the newest 5.x client there
6.1.0	Sep 8, 2021	6.1 features and fixes	Installation guide
6.0.0	Mar 9, 2018	6.0 features and fixes	Installation guide
APPX 5.5 SSL needs desktop clients 5.4.4c or later (details).
5.5.4	Dec 29, 2025	5.5 features and fixes	Installation guide	The 64-bit Linux installer installs a 32-bit engine
5.5.3	Jul 14, 2025	5.5 features and fixes	Installation guide
5.5.2	Jun 3, 2024	5.5 features and fixes	Installation guide
5.5.1	Jul 27, 2020	5.5 features and fixes, 5.5.1 patches	Installation guide
5.5.0	Apr 4, 2020	5.5 features and fixes	Installation guide
APPX 5.4 From 4.x, upgrade from 4.2.a (details).
5.4.7	Jan 16, 2019	5.4.7 features and fixes	Installation guide	SSL needs desktop clients 5.4.4c or later (details)
5.4.6b	Jan 4, 2018	5.4.6b features and fixes	Installation guide	SSL needs desktop clients 5.4.4c or later (details)
5.4.6	Nov 14, 2017	5.4.6 features and fixes	Installation guide	SSL needs desktop clients 5.4.4c or later (details)
5.4.5a	Feb 28, 2017	5.4.5a features and fixes	Installation guide	SSL needs desktop clients 5.4.4c or later (details)
5.4.5	Oct 31, 2016	5.4.5 features and fixes	Installation guide	The earliest release that can upgrade to 6.x; SSL needs desktop clients 5.4.4c or later (details)
5.4.4c	Jun 23, 2016	5.4.4c features and fixes	Installation guide	Introduced the current SSL: desktop clients must be 5.4.4c or later (details)
5.4.3	Dec 28, 2015	5.4.3 features and fixes	Installation guide
5.4.2	Aug 26, 2015	5.4.2 features and fixes	Installation guide
5.4.1	Feb 13, 2015	5.4.1 features and fixes	Installation guide
5.4.0	Dec 19, 2014	5.4.0 features and fixes	Installation guide
APPX 5.3 to 5.0 From 4.x, upgrade from 4.2.a (details).
5.3.3	Aug 19, 2014	5.3 features, patches	Installation guide
5.3.1	Mar 11, 2014	5.3 features, patches	Installation guide	Needs the date arithmetic setting from bug 850 (details)
5.3.0	Dec 31, 2013	5.3 features, patches	Installation guide	Needs the date arithmetic setting from bug 850 (details)
5.2.6a	Dec 16, 2013	5.2 features, patches	Installation guide	Needs the date arithmetic setting from bug 850 (details)
5.2.6	Nov 6, 2013	5.2 features, patches	Installation guide
5.2.5	Jun 28, 2013	5.2 features, patches	Installation guide
5.2.4	Apr 18, 2013	5.2 features, patches	Installation guide
5.2.3	Mar 19, 2013	5.2.3 fixes	Installation guide
5.2.2	Mar 19, 2013	5.2.2 fixes	Installation guide
5.2.1	not recorded	5.2.1 fixes	Installation guide
5.2.0	Nov 6, 2012	5.2 features, patches, fixes	Installation guide
5.1.2	not recorded	5.1.2 fixes	Installation guide
5.1.1	Sep 4, 2012	5.1.1 fixes	Installation guide
5.1.0	not recorded	5.1 features, fixes	Installation guide
5.0.4	Feb 27, 2012	5.0 features, fixes	Installation guide	Upgrading from 5.0.0 to 5.0.2 needs special steps (details)
5.0.2	not recorded	5.0.1 and 5.0.2 notes	Installation guide
5.0.1	not recorded	5.0.1 and 5.0.2 notes	Installation guide	Not for production use (details)
5.0.0	not recorded	5.0 features, fixes	Installation guide	Not for production use (details)
APPX 4.2 Install every file, then the extra steps in the installation guide (details).
4.2.a	Jan 3, 2007	Release notes	APPX 4 installation	The last 4.x release, and the one to upgrade to 5.x from
4.2.9	Dec 7, 2005	Release notes	APPX 4 installation	Delete two PRINTER files when coming from 4.2.7 or earlier (details)
4.2.8	Nov 7, 2005	Release notes	APPX 4 installation	Delete two PRINTER files when coming from 4.2.7 or earlier (details)
4.2.7	Jun 13, 2005	Release notes	APPX 4 installation
4.2.6	Dec 7, 2004	Release notes	APPX 4 installation
4.2.5	Nov 11, 2004	Release notes	APPX 4 installation
4.2.4	Apr 27, 2004	Release notes	APPX 4 installation
4.2.3	Mar 16, 2004	Release notes	APPX 4 installation
4.2.2	Jan 14, 2004	Release notes	APPX 4 installation
4.2.1	Jan 7, 2004	Release notes	APPX 4 installation
4.2.0	Dec 17, 2003	Release notes	APPX 4 installation
APPX 4.1 Read each release's Important Notes first; applications converted to 4.1 cannot go back (details).
4.1.b	Apr 16, 2004	Release notes	APPX 4 installation	Engine only; install over 4.1.a
4.1.a	Jul 24, 2002	Release notes	APPX 4 installation
4.1.9	Oct 15, 2001	Release notes	APPX 4 installation
4.1.8	Sep 12, 2001	Release notes	APPX 4 installation
4.1.6	Jul 18, 2001	Release notes	APPX 4 installation
4.1.5	May 15, 2001	Release notes	APPX 4 installation
4.1.4	Apr 24, 2001	Release notes	APPX 4 installation
4.1.3	Nov 22, 2000	Release notes	APPX 4 installation
4.1.2	Nov 7, 2000	Release notes	APPX 4 installation
4.1.1	Oct 17, 2000	Release notes	APPX 4 installation
4.1.0	Oct 3, 2000	Release notes, new features	APPX 4 installation
APPX 4.0
4.0.a	Apr 25, 2000	Release notes	APPX 4 installation
4.0.9	Dec 16, 1999	Release notes	APPX 4 installation
4.0.8	not recorded	Release notes	APPX 4 installation
4.0.5	Nov 4, 1999	Release notes	APPX 4 installation
4.0.4	not recorded	Release notes	APPX 4 installation
4.0.3	not recorded	Release notes	APPX 4 installation
4.0.2	Jul 7, 1999	Release notes	APPX 4 installation
4.0.1	not recorded	Release notes	APPX 4 installation
4.0.0	not recorded	Release notes, client notes	APPX 4 installation
APPX 3
3.5.2	Feb 19, 1999	Release notes
3.5	not recorded	Release notes
3.4	not recorded	Release notes
3.3	not recorded	Release notes
3.2	not recorded	Release notes