Run the setup.exe from that new folder. This ensures the installer has direct access to ProPlusWW2.cab without any drive emulation lag. Use the Microsoft Support and Recovery Assistant (SaRA)
Compressed Files: The ProPlusWW2.cab file is a compressed archive that may have become unreadable. How to Resolve Missing .msi and .cab Files
Select the ProPlusWW.msi file inside that folder and click OK. Extract the ISO File
Create a configuration.xml file specifying "ProPlusRetail" or "ProPlus2019Volume."
This will download a fresh, complete set of files including all necessary .cab archives. Best Practices for a Better Office Installation