This procedure must be performed on your main node, and on any network rendering nodes!
Find your Carrara installation directory. Copy Shoestring_shaders.dat, Shoestring_shaders.txt and Shoestring_shaders.mcx to the Extensions subdirectory, or to any subdirectory under it. I like to keep my plugins in separate directories to make them easier to locate. So I have a DCG directory, and a Shoestring directory, for instance.
Render nodes are done just as above, except that the path is \Render Node\Extensions. You don’t need to put the password in on render nodes.
When you initially use one of the shaders, ie add it to a shader tree, a dialog box will open and ask for your password. To evaluate the software, just hit cancel, or ok. You can even guess at a password if you want. In evaluation mode, a random portion of the object you are shading will be black. Every time you open a file that includes a Shoestring shader, or add one, you will see the dialog. Once you have purchased the plugin, a password will be emailed to you- simply enter it in the box, and two things will happen. The black spots will go away, and the box will stop popping up. There will be a file called Shoestring_shader_password.txt created in your \Extensions directory. If this file is altered or moved, the plugin will ask for the password again! If you leave it alone, everything will be copacetic. ;-)
The shaders are found in the shading room, in the drop down menus- where you pick things like Color, Value, Noise, etc for your various shading channels.
www.desweb.net/shoestring_graphics.html