Processes in Microsoft 365 for setting up Office apps, redeeming product keys, and activating licenses.
Hi Ben
You'll be pleased to know that you don't need a new product at all. You can use Office 2011 in Catalina. All you need is Parallels:
How to Set up Your Catalina Mac to Run 32-bit apps
Alternatively, Microsoft provides a completely free edition of Microsoft Office at OneDrive.com. The free version is more advanced that Office 2011. The free version supports many of the latest features that Office 2011 does not. Here's a screen shot showing the New menu where you can get started making Word documents, Excel spreadsheets, and PowerPoint presentations. Even OneNote and Forms are supported.
The free version supports features like the new equation editor across the board, Word content controls, new Excel formulas, new PowerPoint animations. And it's free. Did I mention that it's free. You don't have to pay for it.