Designed to work as a plug-in within Adobe Photoshop, using similar shortcut keys and menus. How to Download Corel KnockOut 2

Finding a legitimate download for Corel KnockOut 2 can be challenging because it is technically "legacy" or "abandoned" software.

Allows professionals to work directly with CMYK images without converting to RGB.

Run the setup file. When asked for a destination, point it to your Photoshop Plug-ins folder.

Navigate to the Filter menu. You should see "Corel" or "KnockOut" listed there. KnockOut 2 update adds Photoshop 7 support, more - Macworld

Since the official Corel site no longer lists it for sale, some users find it on software archive sites like Apponic or Software Informer.