The term is not an official Adobe codename. In internet folklore, "White Rabbit" often refers to:
: Even if you find the original installer, Adobe's activation servers for older software may no longer be reliable. Official Alternatives
You can still see the original "White Rabbit" artwork by holding Ctrl (Cmd) while clicking About Photoshop in the Help menu. Key Features: CS5 introduced groundbreaking tools like Content-Aware Fill Puppet Warp , and improved HDR imaging. Safety & Download Report
By following the link above, you'll be able to download the White Rabbit plugin and start taking advantage of its advanced features and tools. Whether you're a seasoned professional or just starting out, Adobe Photoshop CS5 and the White Rabbit plugin are essential tools for creating stunning images and compositions.
"White Rabbit" was the official internal development codename for Adobe Photoshop CS5