Download the group of folders, extract the contents of each folder to a single new folder so that the extracted contents of each folder are all together and run the BAT file to merge all the files back in to the GSL installer. Then you can run that file to install GSL on to your system.
PS: If you need information on how to use Gamespace feel free to post questions and I will help you get started making 3D models with the software.
Caligari Gamespace Lite is a simplified version of Truespace and is an excellent primer for getting used to how Truespace 7.61 Beta 8 works on the Truespace 6 portion of the software. Use Gamespace until you feel comfortable and then when you are ready to graduate to Truespace the transition will be much easier. Best wishes, BNG123.
The software is pretty ease to use with a little hands on practice. Most modeling tasks are as easy as clicking on the pretty little icons in the modeling workspace. Some of the menu bars may not be fully visible when you first run Gamespace, but this is by design to keep the workspace clean and uncluttered. The menu bars can be expanded by clicking on the left side of each bar. Left clicking will expand the bar to show more icons. If you want to minimize the bar left click it again and it'll change to a tiny gray square. Each click will toggle and expand the bar. The startup prefers can be saved by clicking File>Preferences and in the dialog box Xing the Save State box. This will save your user preferences each time Gamespace opens.