Buy Original Full Script
Link - https://earnlearnduniya.com/go/allvideodownloader
Download by manually at https://aiovideodl.ml/yt-plugin
Extract and upload the ZIP contents (YouTube.php and vendor folder) to /wp-content/plugins/aio-video-downloader/includes/downloaders
Note that this is not a WordPress plugin. Do not try to upload it via WordPress plugins page.
Please do not use WordPress file manager plugins.