Robocopy is one of the most-used command-line utilities to copy large volumes of data in Windows. If you want to try this, here is a guide for you to check:
https://adamtheautomator.com/robocopy-the-ultimate/
I found that windows 2012R2 unable to install WAC appears to be a known issue for many users. I suggest you use the builtin Windows Feedback Hub app within Windows and provide feedback about this issue so that Microsoft can start working on this issue.
Thanks for your time!
Best Regards,
Mico Mi
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