Many sites offering "Windows Upgrade Mate" services sell keys at suspiciously low prices ($5–$15). These are often "gray market" keys—OEM keys intended for other regions or volume keys that may stop working after a few months. To protect your computer and your wallet:
It sounds like you're asking about upgrading a license key — but just to clarify, there is no Microsoft product called “Windows Mate.” You may be referring to one of the following: windows upgrade mate license key