Adobe Photoshop CS6 SDK
Adobe® Photoshop® CS6 is now 64 bit only on the Macintosh operating system. Adobe® Photoshop® CS6 is 32 and 64 bit on the Windows operating system. Photoshop plug-in developers will need to use the SDK to update plug-ins to run with the 64-bit version of Photoshop.
Developers will need to meet the requirements before proceeding with converting a plug-in conversion:
The SDK provides details in converting the dissolve example plug-in. See the "Making 64-bit plug-ins" page in the documentation section of the SDK after downloading.
Archived Photoshop SDKs
Photoshop CS3 SDK
Download the Photoshop CS3 SDK universal binary (ZIP, 11.8 MB)