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Topic: Photoshop extension will not install.

I have Adobe CS4 and I downloaded the Photoshop Extension through Extension Manager only to be told it can't instal because I need Photoshop 12 or greater. It asks me to install Photoshop CS4 or use EM CS3. What is that all about? Can I use the Extension for Extension Manager CS3?

Re: Photoshop extension will not install.

Rather than just double-clicking the .mxp file, right-click the link for your Adobe Extension Manager, select 'Run as administrator' and then go to 'File -> Install Extension' from the drop-down menu at the top and navigate towards the .mxp file.
Otherwise, you could download the .zip file for Photoshop CS2 or CS3 and follow the instructions for installing it on this page.
The plugin files are exactly the same when extracted, they are just packaged in a .zip file for CS2 or CS3 instead of a .mxp file for CS4 or higher.