In order to uncompress the files you will need to use a compression utility,
such as the built-in features of OS X or Stuffit Expander.

Important note: The Patcher utility is used to patch form·Z, form·Z RenderZone, and form·Z RadioZity from v6.1.0 to the latest version. See the Patcher instructions included with the download for details using this utility. You will need to download the Patcher utility as well as the necessary patch files depending on what executables you need to patch. You must use this patcher for installing the 6.1.2 patch. Do not use any previous version of the patcher utility.

Download the patcher here first:PATCHER (v.4.6) or PATCHER Installer (v.4.6)
A list of corrections is available: 6.1.2 Corrections

Single-Processor These Patches will patch the single-processor version 6.1.1 to version 6.1.2 form·Z 6.1.1 to 6.1.2 patch (25.6 MB) form·Z RenderZone 6.1.0 to 6.1.2 patch (50.8 MB) form·Z RadioZity 6.1.1 to 6.1.2 patch (51 MB) form·Z Render Client (18.6 MB) Multi-Processor These Patches will patch the multi-processor version 6.1.1 to version 6.1.2 form·Z RenderZone 6.1.1 MP to 6.1.2 MP patch (50.8 MB) form·Z RadioZity 6.1.1 MP to 6.1.2 MP patch (51 MB) form·Z Render Client MP (18.6 MB) form·Z Render Server form·Z Render Server (2.5 MB)

Single-Processor These Patches will patch the single-processor version 6.1.0 to version 6.1.2 form·Z 6.1.0 to 6.1.2 patch (25.6 MB) form·Z RenderZone 6.1.0 to 6.1.2 patch (27.9 MB) form·Z RadioZity 6.1.0 to 6.1.2 patch (18.7 MB) form·Z Render Client (4.5 MB) Multi-Processor These Patches will patch the multi-processor version 6.1.0 to version 6.1.2 form·Z RenderZone 6.1.0 MP to 6.1.2 MP patch (27.9 MB) form·Z RadioZity 6.1.0 MP to 6.1.2 MP patch (18.8 MB) form·Z Render Client MP (2.5 MB) form·Z Render Server form·Z Render Server (528 KB)