Important: This is a beta version. Do not use this on a site you care about unless you do a complete backup of the site (files and database) first, and are prepared to restore it if things go south.
UpgradeMODX installs a dashboard widget that alerts you when there is an upgrade to MODX available -- and installs it for you!.
When there is an upgrade available, UpgradeMODX will show an "Upgrade MODX" button. Clicking on the button will show a form where you can select the version of MODX to install. Once you've selected a version, you can click on the "Install" button to launch Setup.
When Setup is finished, you'll be back in the Manager using a new version.
UpgradeMODX should work on any installation of MODX except the SDK version. That includes versions with renamed and/or moved directories.
The Beta version has been working fine for me on a number of different sites, but most are localhost installs. It has not been tested on a variety of platforms and might not work for you. That's your job. ;)
The minimum version listed below is a guess.
New in UpgradeMODX 1.0.2-beta1
Fix bug with earlier versions of PHP