CEP Extensions first became available for After Effects in version CC 2014. CEP extensions give you all the benefits as Script UI panels, however they also allow for much more complex and user-friendly interfaces.

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If you follow all the Ae instructions and AEUX still isn't showing up in the AE WindowExtensions menu, do a manual install. You didn't do anything wrong, it just happens sometimes wth extensions. Download ZXP Installer from aescripts + aeplugins; Drag Overlord.zxp into ZXP Installer; Close and re-open After Effects and Illustrator; Navigate to the top Window menu, Extensions Overlord.

Using an Installer

To install an extension, which has a .zxp file type, it is simplest to use an installer. Adobe has their own installer, however it limits your Extensions to what is available on Adobe's own platform. A much simpler and open option is to use the ZXP Installer from aescripts.com. It is available for free for both Mac and Windows.

Once you've downloaded and installed the ZXP Installer, simply open the .zxp extension in the installer. The ZXP Installer will take care of the rest. Once the extension has been installed, you can see basic information about the extension, such as its version.

To run the extension, restart After Effects and go to:

Installing Manually

If you would prefer not to use an installer, you may install extensions manually, however the process is not user friendly.

On Windows

1. Rename your .zxp extension file to use .zip instead. (You'll get a warning, but just click OK)
2. Unzip the file, you should get a folder. Rename it if desired
3. Copy that folder into C:Program Files (x86)Common FilesAdobeCEPextensions
4. Restart After Effects
5. Your extension should now show up under Window > Extensions

On Mac:

1. Rename your .zxp extension file to use .zip instead.
2. Unzip the file, you should get a folder. Rename it if desired (You may need a 3rd party utility to unzip)
3. Copy that folder into ~/Library/Application Support/Adobe/CEP/extensions
4. Restart After Effects
5. Your extension should now show up under Window > Extensions

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After installing the extension, restart After Effects and go to tab Window » Extensions » Atom.

Need more details? Watch video tutorials!

Choose type to install extension.

1. Visit site: aescripts.com/learn/zxp-installer/
2. Download application for your operation system and install.
3. Run installer.
4. Extract all files from downloaded ZIP-archive.
5. Drag and drop file *.ZXP into installer and wait progress installing.

1. Visit site: zxpinstaller.com
2. Download application for your operation system and install.
3. Run installer.
4. Extract all files from downloaded ZIP-archive.
5. Drag and drop file *.ZXP into installer and wait progress installing.

Extract all files from downloaded ZIP-archive. (use 7-Zip, WinRAR or other software).

Find the Atom extension (*.ZXP)

Rename file type from ZXP to ZIP, or just open as archive.

Extract files from this archive into folder Atom (create if need).

Move the Atom folder into directory with extensions:

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Windows:Program Files (x86)Common FilesAdobeCEPextensions

Zxp File After Effects

Zxp After Effects Projects

MacOS:Library/Application Support/Adobe/CEP/extensions

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If no exists folders CEP or Extensions in the mentioned directories – create it manually.