Microsoft Visual Basic 6.0 is not officially available as a free "portable" or "no install" download from Microsoft
But this is not truly portable and often fails due to missing COM registrations.
Risk: Unofficial portable versions found on third-party sites are often illegal copies and may pose security risks like malware. How to Run VB6 on Modern Windows (10 & 11) Thread: is VB6 Software legally free for use? - VBForums Microsoft Visual Basic 6
A portable version of Visual Basic 6.0 is a modified package designed to run directly from a folder or USB drive.
Leo double-clicked the icon. A splash screen featuring the classic Microsoft "gears" logo flickered to life. For a tense ten seconds, the hard drive whirred, protesting the ancient DLL files being injected into the temporary memory. Then, the grey grid of Form1 appeared. - VBForums
A portable version of Visual Basic 6
A portable version allows you to run the VB6 IDE directly from a USB drive or a local folder without a standard installation process.
In the history of software development, few tools have left as significant a mark as Microsoft Visual Basic 6.0 (VB6). Released in 1998, it became the go-to rapid application development (RAD) environment for millions of developers worldwide. Even decades later, thousands of legacy enterprise applications, small utilities, and educational projects still rely on VB6. For a tense ten seconds, the hard drive
This is a grey area.