How to delete the remnants of an old program that no longer exists?

Hello everyone I used to have the Teamviewer program installed on an external drive. That disk doesn't work now. Broken. I want to reinstall TeamViewer, but the Win 10 system says that delete the ALREADY installed program and only then install this one. How to delete the remnants of an old program that no longer exists? I was digging in the registry. I didn't find any files there.

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