: Since its original release in 2015, Microsoft has periodically released "Updated" versions of this ISO. For instance, a version exists called SW_DVD5_Office_Professional_Plus_2016_Updated_May_2020_64Bit_ChnSimp... , which integrated many updates up to May 2020 to make a fresh installation more convenient.
The file you are looking at uses the technology. This is the traditional method for Volume License versions of Office. In fact, SW_DVD5_Office_Professional_Plus_2016_64Bit_English_MLF_X20-42432.ISO is specifically noted as "the last old MSI Installer version". swdvd5officeprofessionalplus2016w64english updated