Go to Adobe Exchange and select Creative Cloud extensions.
In the Creative Cloud extensions tab, select the name of the extension that you want to install, and then select Installation Help.
Download the plugin using the provided download button.
If you can't find the download button, contact the plugin vendor. You'll find their contact information on their partner profile page on Adobe Exchange.
Once the download is complete, enter Command Prompt in the Windows search bar.
In the Command Prompt window, type this command and press Enter:
C:\Program Files\Common Files\Adobe\Adobe Desktop Common\RemoteComponents\UPI\UnifiedPluginInstallerAgent
Type this command and press Enter to install your plugin:
UnifiedPluginInstallerAgent.exe /install c:\[filename].[extension]
If the plugin or extension file is myfile.ccx, the command line will be:
UnifiedPluginInstallerAgent.exe /install c:\myfile.ccx
After installing, test the plugin to ensure it works correctly.