Some researchers use Google dorks to find open directories, but this is risky. Example:

intitle:"index of" "office" -inurl:htm -inurl:html -asp -php

Note: Using such searches to find unlicensed software is against Microsoft’s terms and may violate copyright laws. It also exposes you to security threats.

Instead of just a file name, each row has a + icon. Clicking this expands a "Quick View" panel without leaving the page.

Websites like the Internet Archive (archive.org) use directory indexing to let you browse old, unsupported software. You can find Microsoft Office 95, Office 97, or Office 2000 in these archives. However:

Many employers and universities provide Microsoft 365 A1 for students or Microsoft 365 Business Basic for employees. Check your organization's IT portal. You may already have a legitimate license you are not using.

If you need to see a list of updates (KB articles) for each Office version, Microsoft provides a safe index: 👉 https://docs.microsoft.com/en-us/officeupdates/

Here you’ll find an indexed list of every update, release date, and what it fixes.

If you want a perpetual license (no subscription), buy Office Home & Student 2021 directly from Microsoft or an authorized retailer like Best Buy, Amazon (sold by Microsoft), or Target. Price is typically $149.99 and includes:

Never buy a $20 "lifetime license" from a third-party marketplace. Those are either stolen volume license keys or MSDN keys that will be revoked.