Open 4K Video Downloader and click the "Paste Link" button.
The software will prompt you to download the whole playlist or individual videos.
If downloads are slow, check for application updates (Tools > Check for Updates), limit simultaneous downloads, or temporarily disable VPNs.
Follow the on-screen instructions to install and activate your license key if using the PRO version.
The Pro license is a one-time purchase, covering up to three computers.
Go to your browser, open the video (YouTube, Vimeo, etc.), and copy the URL from the address bar.