Photoshop CS5 on Mac OS was reworked on a fundamental level to run as a 64-application under the 64-bit versions of Mac OS. Therefore, old and 32-bit plug-ins don't run, can return errors, or cause crashes when you use them in the 32-bit or 64-bit versions of Photoshop. See below for instructions on how to open Photoshop CS5 in 64-bit and 32-bit modes.
What's covered
- Confirming that third-party plug-ins are compatible
- Plug-ins available via web download
- Plug-ins supported in 32- and 64-bit Windows, and only 32-bit Mac OS
- Plug-ins no longer supported in Photoshop CS5
- Plug-ins supported only in 32-bit Windows and Mac OS
- Plug-ins available via web download - supported in 32- and 64-bit Windows and Mac OS
- Plug-ins available via web download - supported in 32- and 64-bit Mac OS
- Show All
As with all previous versions of Photoshop, don't copy old third-party plug-ins, or plug-ins from previous versions of Photoshop, into the Photoshop CS5 plug-ins folder. If you have set the Additional Plug-Ins Folder in the Plug-Ins preferences to a folder, deselect this option. Or, make sure that all the plug-ins in this folder are compatible with Photoshop CS5. Contact third-party plug-in manufacturers for versions of their plug-ins that are compatible with Photoshop CS5, either 32 bit or 64 bit.
Some plug-ins that were available for previous versions of Photoshop are no longer available for CS5. Others are available as a web download, but are not installed by default. The plug-ins available via web download are bundled together.
Download the optional plug-ins from these locations:
For Mac OS: http://www.adobe.com/support/downloads/detail.jsp?ftpID=4965
For Windows: http://www.adobe.com/support/downloads/detail.jsp?ftpID=4688
Note: Review the ReadmeCS5_Optionalplugin.pdf file in with the downloaded files for installation instructions.
- Lighting Effects
- Extract (For an improved feature, choose Select > Refine Edge.)
- Variations
- Contact Sheet II (For an improved feature, create contact sheets in Adobe Bridge.)
- Web Photo Gallery (For an improved feature, create galleries in Adobe Bridge.)
- Layer Comps to WPG
- PatternMaker
- PhotoMergerUI
- Picture Package (To simulate this feature in CS5, use Smart Objects.)
- FireWire
- FireWire DLL
See below for instructions on how to open Photoshop CS5 in 64-bit and 32-bit modes.
- Send Video Preview to Device
- Video Preview
See below for instructions on how to open Photoshop CS5 in 64-bit and 32-bit modes.
- DisableGetInfoComment
- DisableScratchCompression
- ForceVMCompression
- ForceVMBuffering
- DisableVMBuffering
- RememberSlowFiles
- UnlimitedClipboardSize
- Overscroll Always
- Overscroll Floating Windows
- Tool presets are no longer backward compatible.
- TWAIN - The TWAIN scanner plug-in is no longer installed with Photoshop CS5, but is available via web download. Supported when running Photoshop CS5 on 32-bit Windows or 32-bit Mac OS. Also supported as a 64-bit application on 64-bit Mac OS with scanners that support 64-bit scanner drivers. The TWAIN scanner plug-in is also supported if you run Photoshop CS5 as a 32-bit application on 64-bit Windows or 64-bit Mac OS. For more information, see TWAIN plug-in | Photoshop CS4, CS5 (kb405072).
- Legacy droplets not supported in Mac 10.5, 64 bit. Rosetta required to run droplets.

Deselect this option to run Photoshop CS5 in 64-bit mode.
Run Photoshop CS5 in Windows as a 32-bit application:
Run Photoshop CS5 in Windows as a 64-bit application (if your version of Windows and your hardware supports 64 bit):

