A new documentation is available for Squash TM 2.0 and later versions, check it here
This article explains how to install and run Squash TM. The application is packaged in several forms :
A Windows executable, installer included (.jar)
A universal package compatible with Windows, Mac and Linux (downloadable in .zip or tar.gz)
A debian package (deprecated from 1.22 and not supported from Squash TM 2.0)
A redhat package (deprecated from 1.22 and not supported from Squash TM 2.0)
2.00 - Squash TM 1.13+ installation
2.01 - Installation with Windows
2.02 - Installation with Debian/Ubuntu
2.03 - Installation with Redhat/CentOS
2.04 - Installation with tarball
2.05 - Installing another database (recommended)
2.07 - Installing and configuring a Squash TM plug-in
Information about the minimal necessary configurations and prerequisites are here : Minimal necessary configuration and prerequisite