You can buy the single license for approximately $24 or download it via an Envato Elements subscription if it is listed there.
Avoid "free download" sites claiming to host this specific ZIP file for free. These are often "nulled" files that commonly contain malware or broken project links that will crash After Effects. Download Mosaic Photo Reveal Corporate Logo 30636914 zip
No plugins are typically required, and it includes a video tutorial within the zip file. You can buy the single license for approximately