Downloading version 4.6 wasn't just another update; it was the final, most powerful version of the plugin ever released for Photoshop CS3. It brought: New Life to Old Software:
You can find the ACR 4.6 installer on the Adobe FTP site or archived support pages. Look for the file named: Camera Raw 4.6 update adobe camera raw 46 download better
Even with a successful installation, you may hit snags. Downloading version 4
If you just need to process RAW files better on an old PC, consider Adobe DNG Converter + an older Lightroom or free tools like RawTherapee (supports old OS, modern algorithms). If you just need to process RAW files
: If you are using Photoshop Elements 5.0 (Windows) or Elements 4.0.1 (Mac) , version 4.6 is also your maximum upgrade path. Where to Find the Official Download