After that, you should have a folder which contains the OpenColorIO AE Manual.pdf and the OpenColorIO.aex.
Copy the OpenColorIO.aex to this path:
C:Program FilesAdobeAdobe After Effects 2022Support FilesPlug-insEffects
After that, you can delete what you’ve downloaded.
If you can’t find the path, Just make a right click on After Effects in your start menu and click on open file location. This should lead you to a file called Adobe After Effects 2022, but that is just a link, so you have to right-click and click on open file location again, which brings you into the Folder of After Effects there you need to open the Folder Plug-Ins. And then copy the file into the Effects Folder.
Installing Plug-Ins in After Effects was never simple , but we are not done yet.