I recently installed a new operating system on my laptop, however I now wish to revert back to the previous operating system that came pre-installed on the laptop (no, there is no back-up to be recovered. I wiped the laptop completely before installing the new OS). Microsoft's website will not allow me to download the .iso using the key provided on the sticker attached to the laptop, as it says that it is the key for a pre-installed operating system and I need to retrieve the .iso from the manufacturer. What should I do to retrieve the file and install the original OS?
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