Thanks Rox-Ralf for the reply. I am certain I entered the correct code for the HD/BD Plug-in. Yes, OWC provided on the DVD envelope separate serial numbers for Toast 12 and the HD/BD plug-in. The Toast 12 serial number entered into the installer and installed with no problem. There were "zero's with the plug in serial number that I also tried letter "O" just to be sure and I still have the same no install possible result with a greyed out "Next" button. (There were no I's to confuse with 1with my case). I tried both serial numbers for the HD/BD plug in but the serial number for the HD/BD plug in is clearly labeled - again no success. I have successfully registered both products on the Roxio site and received e-mail conformation; however, in neither case was a support code sent so I can't enter Roxio's tech support to submit a trouble ticket. It seems they are not set up to handle a physical software delivery of their software from an outside source (OWC in my case). If I had performed an electronic dowload, then Digital River would have a reference to me and then they would be able to assist me. BTW, just for fun, I did enter the Mac OS "safe mode" and I had the same result as normal startup without success installing the HD/BD plug-in.