The primary official method for developers to obtain a legal copy and product key is through a paid Visual Studio Subscription (formerly MSDN). VB6 is often included in the downloads section of higher-tier subscriptions, such as Visual Studio Professional or Enterprise.
There are several online sources that claim to offer free product keys for Visual Basic 6.0 Enterprise Edition. These sources may include: visual basic 60 enterprise edition product key free
Searching for a "free product key" for Visual Basic 6.0 Enterprise Edition The primary official method for developers to obtain
The official successor; it is free and powerful. These sources may include: Searching for a "free
If you need a free, legal alternative for learning or legacy project maintenance, consider using Visual Studio Community (for VB.NET) or the open-source project (aims for VB6 compatibility). Please avoid any site offering “free product keys” — these are often scams, malware vectors, or illegal.
Historically, early versions of Visual Studio 6.0 had notoriously simple validation. Many developers from that era remember that entering a string of ones (e.g., 111-1111111