If you don't want to install software, here is the most reliable manual "online" method using your browser's built-in tools:
For Fluid Player implementations that use direct MP4 links (common on smaller blogs or portfolios), classic online aggregators work well. fluid player video downloader online top
Fluid Player allows users to change quality (e.g., 720p to 1080p). When downloading, ensure the video is playing at the highest quality setting so the downloader grabs the best version. If you don't want to install software, here