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Hi @KC, Salvin (ext),
Welcome to Microsoft Q&A!
For VS2015, please remove the registry key (Before you delete it, I suggest you first export the registry key, so you'll have a backup if you accidentally delete the wrong key.):
HKEY_CLASSES_ROOT\Licenses\4D8CFBCB-2F6A-4AD2-BABF-10E28F6F2C8F
The following table lists the Microsoft Product Code (MPCs) for Visual Studio 2015:
Sincerely,
Anna
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