The tool "Office 2013-2021 C2R Install" (often created by developer Ratiborus) is third-party, non-official
Absolutely. Starting with Office 2013 and fully maturing by Office 2021, Click-to-Run has replaced MSI entirely. Even Microsoft’s own documentation states that "C2R is the only deployment method for Office 2021 and Microsoft 365 Apps." Download- Office 2013-2021 C2R Install - Instal...