The latest software for the Rio Central HSX-109 Advanced Digital Audio Center can be found at
http://www.digitalnetworksna.com/support/rio/product.asp?prodID=100. It supports the rebadged Dell Receivers (the black ones with the Rio sticker covering the Dell logo), and fixes the bug which caused it to reboot during multiple-CD-record mode.
Please note that this is in the form of an
ISO Image which must be burned onto a CD-R. That means you must know the difference between
burning an image and
burning the file onto a CD. If you do the latter, it won't work.
Burning an image usually involves finding the correct menu option in your CD burning software. On my software, the option is "Create CD from image file", but it may be different in yours.