Summarize this article:

Type any video converter free into a search engine, press ↵ Enter, and click the AVC Freeware link that will appear near the top of the search results. There are two Download buttons at the bottom of the Any Video Converter Free column of options. Click the one with the Windows logo for Windows computers, or click the one with the Finder icon on it for a Mac. Once the setup file finishes downloading onto your computer, you can continue. You may need to click Save or select a save location for the file before it will downloading. Make sure you opt out of any additional software if necessary. To install AVC:  Windows - Double-click the avc-setup file, click Yes when prompted, afterwards click Customize Install, then click Install, click Back, then click Customize Install again, and click Install. Finally, click Finish when the installation is complete. Mac - Double-click the avc_free_mac file, verify the software, and then follow any on-screen prompts. It's an image of a blue globe with a green iPod on it. Once AVC is open, you can proceed with downloading a YouTube video.

Summary:
Open the Any Video Converter site. Click your operating system's Download button. Wait for your download to complete. Install Any Video Converter. Open Any Video Converter.