Once you have downloaded the twilight installer, run it.  Use next to move through the options, accepting the license when prompted.  The installer should locate your installation of SketchUp, but if it doesn't, browse to the SketchUp/Plugins folder and hit 'Ok'.

If this is the first time you are installing Twilight, you may be asked to install the Microsoft Visual C++ 2008 runtime libraries.  These are the dependencies provided by Microsoft and are required by Twilight.

You may, but are not required to, uninstall any previous version of Twilight using the uninstaller located in theSketchUp/Plugins folder.

The Twilight Render installer will attempt to locate your installation of either Google SketchUp 6 or Google SketchUp 7.  Under most circumstances, this will be C:/Program Files/Google/Google SketchUp 6 or C:/Program Files/Google/Google SketchUp 7 but may be different if you have selected a different location when you installed SketchUp.  Twilight will be installed in the Plugins/Twilight subdirectory.

• Proceed to the online store and follow the directions there to place your purchase order. 
• Then, launch SketchUp and open the Twilight Options window. 
• Go to the 'About' section.  Click on 'Request License'. 
• You will be prompted to save a license request file.  Save, then email that file to licensing [at] TwilightRender [dot] com. 
• Make sure you include the email you used when placing your purchase order.  We will respond quickly with a license code.
• If you are using Twilight Render v1.1 or later, your will receive a license code.
  • Reopen SketchUp and open the Twilight Options window.  Go to the 'About' section
  • Click on 'Activate Twilight' and enter your code and email 
• If you are using Twilight Render v1.0.19 or ealier, you will receive a license file. 
  
  • Save the file to your computer.
  •  Reopen SketchUp, and open the Twilight Options window.  Go to the 'About' section. 
  • Click on"Install License" and select your saved license file.
• Your copy of Twilight Render is now installed.

This information is only relevant to v1.0.19 or earlier.  Starting with v1.1, activation is done using a text code.

The easiest way is to open the options window, and select 'About'.  Hit the 'Install License' button, select your newly received twilight.lic file, and hit Ok.  It's a good idea to keep a copy of your license somewhere safe, just in case.

 -or-

Locate your installation of Sketchup (by default, something like C:/Program Files/Google/Google SketchUp 7).  Open the Plugins/Twilight folder and copy the license file there.