Converting a retail C2R installation of Office 2019 to a volume-licensed version isn't straightforward due to technical and licensing differences. However, with the right approach and tools, such as the Office Deployment Tool, organizations can manage and deploy Office installations effectively. Always test any conversion process in a controlled environment before rolling it out organization-wide.
There are several reasons why the conversion process may fail, resulting in the error message: Converting a retail C2R installation of Office 2019
Unlike older versions (Office 2016 and earlier) that used traditional MSI installers, Office 2019 exclusively uses technology. C2R streams installation files and updates via the internet. While this improves update efficiency, it complicates licensing. with the right approach and tools