Yazsoft today announced the availability of Speed Download 4.1.6, an important update to the the fourth generation of Yazsoft’s award-winning download manager for Mac OS X. Version 4.1.6 adds some key new features and improvements and is a recommended update for all Speed Download 4 users. The include: full compatibility with RAPIDSHARE servers; Speed Download records the location from where the file was downloaded — you can check this in the comments section when you do a Get Info; performance tweaks; and more. Speed Download is priced at US$25.