How best to retain access to old MS Office docs
I recently upgraded my 2013 MacBook Air to Catalina, the newest OS compatible. However, I cannot now open Word docs/Excel spreadsheets without upgrading MS Office 365 (reluctant to do as only a light/infrequent user). I've set up Google Drive but docs cannot be transferred over - can that be done and, if so, how ? Maybe I can download a newer (but not the latest) version of MS Office 365 ? Any suggestions or experience of this issue would be greatly appreciated. Many thanks.
MacBook Air 11″, macOS 10.15