: After installation, open any Office app (like Word), go to File > Help > Activate Product Key to complete the process. Security Warning
| Software | Compatibility with Office 2010 | Price | | :--- | :--- | :--- | | | Reads/saves Office 2010 files well; UI is similar to 2003/2010 hybrid. | Free | | OnlyOffice | Excellent fidelity for DOCX/XLSX; cleaner ribbon UI. | Free / Paid | | Microsoft 365 (Web) | Free tier available; runs in a browser. | Free (basic) | | Office 2021 LTSC | Perpetual license; modern but familiar. | $150+ | Microsoft Office 2010 Iso