If you have a legitimate, previously purchased product key for Office 2010, you may still be able to find backup installation media on the Internet Archive for archival purposes, though Microsoft no longer provides official download links. You will still need your original key to activate it.
You can use Word, Excel, and PowerPoint for free in a web browser via a Microsoft account. If you have a legitimate, previously purchased product
These are free, open-source alternatives that are fully compatible with .docx and .xlsx formats. If you have a legitimate