If you previously purchased Office 2016 but lost your key, you may be able to retrieve it from your system rather than looking for a new "free" one:
Since Office 2016 is now out of support, experts often recommend moving to newer versions for better security. Mashable notes that lifetime licenses for Office 2024 are often more cost-effective than long-term subscriptions if you prefer a one-time payment over a monthly fee. Using product keys with Microsoft 365
Unofficial or cracked installations often block communication with Microsoft servers. This prevents you from receiving critical security patches, leaving your system vulnerable to newly discovered bugs. Safe and Legal Ways to Get Microsoft Office