Step 1: Redeem Your Product Key
Go to setup.office.com
Sign in with the Microsoft account you want the license permanently bound to (or create a new one)
Enter your 25-character product key when prompted (no hyphens needed)
Follow the on-screen instructions to associate the license with your account
Step 2: Download Office
After redeeming the key, click "Install Office"
The correct installer for your device (PC or Mac) will be detected automatically
Note: The installer may be labeled as Microsoft 365 — this is normal, it is the universal setup file and does not mean you are downloading Microsoft 365
Step 3: Install Office — PC
Locate the downloaded setup.exe file in your Downloads folder
Double-click it to start the installation
Accept the license agreement and click Install
Grant administrator permission if prompted
Step 3: Install Office — MAC
Go to your Downloads folder and double-click the Microsoft Office installer .pkg file
Click Continue → Agree → Install
Enter your Mac login password if prompted and click Install Software
Click Close when installation is finished