Type Nero6 or Nero 6 and look for a link that works (right click "save target as") and has both the program and other apps (like Vision Express [NVE] and [InCd] etc.) all from the same place. If the one you download is Nero.rar it will probably have a fix inside, if its an .exe then you will have to look for one that has an .nfo file with it (from the same address) for a serial.
The last version 6 is Nero 18.104.22.168. As a matter of fact, you could download all the latest stuff from the Nero site for version 6 and just use the key or serial you can find from the ftp search to register them. The site has 22.214.171.124d with some addon (wch) you don't want, so find a nero 126.96.36.199a or c from the ftp search to replace it.
Some links will not work with "save target as" but will work if you use flashget or an ftp client like FileZilla. FileZilla is the neatest, if you copy a link from your search and use only the ftp address with no path (ftp*://xxx.xx.xxx.xxx), you will end up at the ftp site and see all there is. Then using the copied link for reference, you can follow the path to the files you want. FileZilla downloads from the right window to where ever you have the left window highlighted.