I have just checked my Google sitemap - had been awhile - and noticed that all my download links are no longer valid. You may recall a thread on ravenphpscripts.com awhile back where we were having issues with "download leaching"? I had implemented a "fix" for this and it required using relative URLs for the downloads, so they no longer have the
http:// prefixed on them.
That is why google is saying my URLs are invalid because they no longer have the "http://". I believe that both download content modules need to have a check in them to see if either "http://" or "ftp://" are already present and if not, add "http://" to the front of the url?
If I fix it in the next few days, I'll pass it along...