There is far more involved than just replacing a few build tools. It is difficult to take these question seriously. Where do you expect to get 64-bit versions of all the DLLs and OCXs that VB6 programs need, beginning with the core libraries every program needs even if it doesn't have a Form?

You can find a crude QuickBasic alternative in FreeBasic's QB mode, but it isn't very close to VB6. You can find ways to whang out a GUI with it, but again it isn't close to VB.

If you can't obtain a legal copy of VB6 or it doesn't do what you need, then "These aren't the droids you are looking for, move along." You are posting in the wrong forum.

"Other Basic" is a better place for a thread like this one.