Howtoforge published a tutorial about updating ISPConfig 3.1 webhosting control panel to ISPConfig 3.2.

Updating ISPConfig 3.1 to ISPConfig 3.2

This tutorial explains the steps to update an ISPConfig 3.1 server to ISPConfig 3.2. This tutorial is compatible with the operating systems CentOS, Debian and Ubuntu.

Updating ISPConfig 3.1 to ISPConfig 3.2