Please download the files from the links provided below. Please note that no official support is provided for any of these products. Instead, community support is available via the forums.

trueSpace7.61
This is the full 3D authoring package with no time restrictions and no license restrictions on how you use it. This version is the latest release from Caligari with many bug fixes and improvements to the Link Editor. This version features both the workspace and the legacy Model side.
Download trueSpace7.6 full installation (software and all libraries) - 126Mb
Download trueSpace7.6 PDF Manual - 51Mb
Download trueSpace7.6 Videos - 129Mb

Once you've downloaded and installed the software, be sure to read through the Manual.

trueSpace7.61 workspace only
This is the full 3D authoring package with no time restrictions and no license restrictions on how you use it. This version is the latest release from Caligari with many bug fixes and improvements to the Link Editor. This version has had the legacy Model side removed and features only the new tools in the workspace side. The manual and videos from trueSpace7.61 should be used.
Download trueSpace7.6 workspace only installation (software and all libraries) - 88Mb

truePlay7.61
This is the standalone player / viewer for trueSpace7.61 scenes. You can distribute your 3D scenes in trueSpace RsScn format along with truePlay to allow non-trueSpace users to open and view the scene without having to install the full trueSpace application. It will open scenes from both tS7.61 and tS7.6.
Download truePlay for trueSpace7.61 - 14Mb

trueServe7.61
This is trueSpace version which will allow you to set up and hosts your own shared spaces accessible by combination of trueSpace and truePlay clients. This version of trueServe runs on single computer and hosts maximum 10-15 participants but will allow you to create your own collaborative environments without additional restrictions.
Download trueServe for trueSpace7.61 - 35Mb
Download trueServe Manual - 6Mb

trueSpace7.61 SDK
The SDK for trueSpace7.61, for those who wish to develop plug-ins for it.
Download trueSpace7.61 SDK - 8Mb

trueSpace7.6
This is the previous release of trueSpace, prior to tS7.61 being released on May 22nd 2009, provided for legacy compatibility with previous scripts, scenes and plug-ins. Most importantly, please note that V-Ray users will need to use this version, as V-Ray for trueSpace is not compatible with trueSpace7.61. This version will not load trueSpace7.61 scenes. Please use the manual and videos from the trueSpace7.61 section.
Download trueSpace7.6 full installation (software and all libraries) - 127Mb

Serial Number
These installers do not require a serial number. For legacy purposes only, you may use the following tS7.6 serial number if you wish to run an older installer that requests one:
9752722044273