A family of Microsoft word processing software products for creating web, email, and print documents.
It isn't unusual for an online repair to involve an uninstallation followed by a reinstallation of Office.
Are you saying that there is no difference once Office is up and running again? The "Black" Office Theme is still missing/not working? See if the option is available at File > Account.
I'm finishing a similar issue. I had to reinstall my windows due to some malware issues. Once I installed my Microsoft Office, I cannot access "Dark"/Black theme alone. That option is simply missing. I had been using that theme for a very long time. I tried repairing my office and uninstalled and reinstalled it as well. But none of these worked. I'm at loss as to what I'm supposed to do.