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Using TWAIN in Photoshop CS5 and CS4
   

If you are a Windows OS user using Photoshop CS5, you must manually install the TWAIN plug-in following below steps:
1. Download the Photoshop CS5 Optional Plugins from Adobe website as below: http://www.adobe.com/support/downloads/detail.jsp?ftpID=4688
2. Extract the downloaded file and find "Twain_32.8BA" file in the Win32 or Win64 folder depending on your operating system (32-bit or 64-bit).
Note: You may not see the extension filename of .8BA.
Note: To check whether your system is 32-bit or 64-bit, click the Start button and then right-click on My Computer. From the drop-down list, select Properties.

3. Enable the TWAIN plug-in:
ĦE For Windows 32-bit editions - Quit Photoshop, and place "Twain_32.8BA" (32-bit) in the CS5 plug in directory: C:\Program Files\Adobe\Adobe Photoshop CS5\Plug-Ins\Import-Export\
ĦE For Windows 64-bit editions - Quit Photoshop, and place "Twain_32.8BA"(64-bit) in the CS5 plug in directory: C:\Program Files (x86)\Adobe\Adobe Photoshop CS5\Plug-Ins\Import-Export\
4. Restart Photoshop to enable the plug-in.

If you are a MAC OS user using Photoshop CS5 or CS4:
1. Download the Photoshop CS5 Optional Plugins (for CS5) or Adobe Photoshop CS4 Optional plug-ins and ReadMe English, Spanish and French (for CS4) from Adobe website as below:
CS5:
http://www.adobe.com/support/downloads/detail.jsp?ftpID=4687
CS4:
http://www.adobe.com/support/downloads/detail.jsp?ftpID=4047
2. Extract the downloaded file and find "TWAIN.plugin" file.
3. Quit Photoshop, and place "TWAIN.plugin" in the CS5/CS4 plug in directory: Applications\Adobe Photoshop CS5(CS4)\Plug-Ins\Import-Export\
4. Restart Photoshop to enable the plug-in.

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