There is currently a bug causing the plugin to install into the After Effects 2024 folder instead of 2025.
You will need to copy the plugin into the 2025 folder:
Please make sure After Effects and Video AI are closed, then go to:
Applications > Adobe After Effects 2024 > Plug-ins
Go ahead and copy it and paste in into the 2025 folder:
Applications > Adobe After Effects 2025 > Plug-ins