Since you said you don't have a disk drive, there is no way to use the disks in your box. So you have to download the software installer onto your computer from one of those sites. You don't use your serial number to do the download. Once you have done the download, you use the software installer to install the software. After that you can activate the software, hopefully with the same serial number you bought. But that is a separate step. If at that point the serial number does not work, it is a whole different issue that can be addressed.
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