Several customers say they received product keys that wouldn’t activate or were already used. Reviewers describe software that installed but wouldn’t open, and one person reports an invalid upgrade key with no refund. Separately, one reviewer notes instant key delivery and a quick response from the dealer. Overall, reviews split between repeated activation problems and a single smooth purchase with good service.
Examples from available reviews (Nov 2021 – Feb 2026).
Purchased Office 2019 but could not open the product.
“downloaded and Installed but could not open the product.”
Bought a product key that was already in use.
“Bought a product key and it was already in use.”
Received an invalid Windows 10 upgrade key with no refund.
“Sent a product key that is invalid.”
Dealer was prompt and responsive; key delivered immediately after payment.
“the delivery of the software key was done immediately upon payment.”
Only one reviewer mentions seller service, saying the dealer replied quickly and delivered the key right away. No other reviews highlight speed or responsiveness.
Several reviewers say they paid for keys they couldn’t use. They describe purchases as wasted when activation failed or keys turned out invalid. No one directly says the price felt worth it.
Customers report activation failures and installs they couldn’t use. One reviewer says Office installed but wouldn’t open. Another says they bought multiple keys and none worked.
Reviews repeatedly point to product keys that were invalid or already activated. One reviewer reports ten Office 2016 keys, all unusable. Another cites an invalid Windows 10 upgrade key.
One review mentions fast delivery and a quick dealer response. One reviewer specifically says they didn’t get a refund after an invalid key. Few reviews describe ongoing support or follow-up.
The reviews show a sharp split: several one-star reports about unusable keys versus a single higher-rated note about quick delivery. Most negative experiences center on activation and key validity. In one case, the transaction speed stands out as positive.
For each review, the core experience based on original source reviews.
Sources: Trustpilot (4) · Collected.reviews (1) · Quotes shortened · As of: February 2026
Purchased Office 2019 but could not open the product.
“downloaded and Installed but could not open the product.”
Bought a product key that was already in use.
“Bought a product key and it was already in use.”
Received an invalid Windows 10 upgrade key with no refund.
“Sent a product key that is invalid.”
Bought ten Office 2016 keys but all were already in use.
“they are all bad.”
Very helpful company!! This site provided me the best deal and best experience I could ever get. Like everyone was bit apprehensive of buying key online. But it turned to be very prompt and seamless experience with their product keys. Dealer was very prompt and responsive that added to confidence of purchasing. The prices are competitive and the delivery of the software key was done immediately upon payment. I hope the software continues well.Happy to see such services and network. thank you so much Key Mart for superb service. Very satisfied by the customer support and by lightning fast delivery ..
Really worth every penny
This page combines submitted experiences with public reviews from platforms such as Google, Trustpilot, etc. Recurring points are summarized without changing the content of reviews.
Key Mart sells software product keys and digital licenses online. It offers activation keys for operating systems and office suites, then sends the digital code after purchase. Product pages list the license type, supported platforms, and basic system requirements. Customers get keys by email or through an account page, and can contact support via email or a ticket system.