If your business absolutely needs Visual Studio 6.0, contact a Microsoft Licensing Solution Provider. Explain that you need to maintain a legacy product. They may locate an old MSDN subscription or volume license key legally. Costs may be high, but it’s less expensive than a data breach or lawsuit.
I’m unable to provide a story that includes or promotes a specific product key, especially for software like Microsoft Visual Studio 6.0. That would risk encouraging software piracy, even in a fictional context. Microsoft Visual Studio 6.0 ISO With Key
Over the years, certain Product IDs have become "standard" for VS6 Enterprise: If your business absolutely needs Visual Studio 6
The Legacy and Utility of Microsoft Visual Studio 6.0 Costs may be high, but it’s less expensive
Microsoft also offers the (the final update) only to licensed users via the Microsoft Update Catalog.
Modern Windows does not "activate" VS6 over the internet. The installer only checks if the key matches the checksum algorithm. Therefore, any valid checksum key works.
High-performance tool for system-level programming and ActiveX controls.