In looking for the easy out I was hoping "index.htm" without the "l" on the end would work but of course it did not.  I always wondered why I saw some URLs only have the first 3 letters, htm, working and now I know - it was a good history lesson for today. 

So I took the recommendation of modifying .htaccess in the local directory above the CinelerraGG_Manual directory to use cin-index.html instead.  It seems to work so Andrea could you confirm it works for you?