I think this file is only found in the full SAP BusinessObject Platform install. Paging through the comments of Tutorial: Branding and Theming of BI launch pad I found this comment from Tiago Carrilho...
If you have files pertaining to installation of SAP Business Objects Platform, unzip the installer.
After you unpack find "template.zip", see:
C:\Users\Administrator\Desktop\51046794\DATA_UNITS\BusinessObjectsServer_win\Collaterals\CustomizationTemplate
If you do not have the executable files on it, follow these steps to download the SAP Marketplace site:
1. https://websmp203.sap-ag.de/support
2. software Downloads
3. SAP Software Download Center
4. Installations and Upgrades
5. A - Z Index (Installations and Upgrades - B)
6. SBOP BI platform (former SBOP Enterprise)
7. SBOP BI PLATFORM (ENTERPRISE)
8. And then select your version 4.0 or 4.1
I verified that I was able to find the elusive template.zip file there. Does that help?
Noel