Here you are prompted to select the Rich Client for customizer (Jetty) zip file. The zip file is not automatically included with the installer so you must browse for it in your external location.
Click 'Next' to proceed.
See Also
First Installation or Update: First Installation
Create LoginConfiguration.xml
Further Components to Install
JRE, Database Driver and Zip-File for Valuemation Jetty
Server and DB Connection Parameters
Verifying Credentials
Process Engine and Console
Installation Directory
Summary
Installation and Configuration