Gemini AI solved it for me.
The 3-Minute “Surgical” Fix:
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Open Steinberg Download Assistant.
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Go to Absolute 7 > Groove Agent 6.
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Click the Settings (Gear Icon) in the top right of the Download Assistant.
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Check the “Download Directory.” Go to that folder on your hard drive.
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Inside that folder, look for the Groove Agent 6 Application Installer (it’s about 250–360 MB).
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Don’t just run it. Right-click the installer and select “Run as Administrator.”
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Crucial Step: During the install, if it asks for a location, do not change it. Let it go to the “Default” (Common Files).
This worked as a reinstall after the Download Assistant failed 3 or more times to do it.