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If you have an old URL from a manual or CD case, paste it into the Wayback Machine. Many official download links from 2005–2010 were archived. Navigate to web.archive.org and enter a URL like http://www.maintop.com/download/setup61.exe (if that was the historic path). maintop 6.1 download
You do not need MainTop to view a board if you are willing to convert. maintop 6