I need to download adobe's camera raw for photoshop cs5 where can I download this plug in?
Camera Raw plug-in and Adobe application compatibility
The latest version of Camera Raw compatible with CS5 is version 6.7.
Win: Adobe - Photoshop : For Windows : Camera Raw 6.7 Update : Thank You
Mac: Adobe - Photoshop : For Macintosh : Camera Raw 6.7 Update : Thank You
Which camera make and model are your Raw files from? That may need a later version of Camera Raw in which case CS5 will not be able to open the Raw files.
You'll then have to convert to DNG
Digital Negative (DNG), Adobe DNG Converter | Adobe Photoshop CC
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