One more fix, the option to change the UnRAR path from the right-click menu in the Download List was broken. This one has no Release Candidate designation in the title bar and will become the final production release soon. For preliminary release purposes, I'm calling it RC8.
The installer now will now put up a message if a single core CPU is detected, allowing you to force installation of the multi-core PAR processing DLL's if you want. The installer is unable to reliably detect the number of cores in AMD machines so this is a workaround.
If you have a multi-core AMD machine, please give this a try and let me know if it's working correctly. I was unable to test it myself.
The download link is on the Newsbin Beta Page.