iPhoto was discontinued in 2015 and replaced by the "Photos" app. It will automatically convert your iPhoto library. Hold down the option key while opening the Photos app and select your iPhoto Library.
Regarding Microsoft, Microsoft does not provide free upgrades between major versions of their Office products (unless you subscribe to Microsoft 365) and older versions of Office are not compatible with macOS Catalina or Big Sur.
If you have a version of Microsoft Office that is not compatible, you can either subscribe to Microsoft 365 or you can make a one-time purchase. See: https://products.office.com/en-us/buy/compare-microsoft-office-products-for-mac?ms.officeurl=mac-compare-redir
Or use the free Microsoft Office on the web: https://products.office.com/en-us/free-office-online-for-the-web
or Google Docs: https://www.google.com/docs/about/
or the free and very good Libre Office https://www.libreoffice.org/
or Apple’s Pages and Numbers