Q.-I have a customer that needs to purchase Microsoft Visual Basic with the ability to get VB6 (which was EOL) as their developer needs to use this on a client machine to rebuild executables of a custom SCADA application that they will be utilizing.
Unfortunately it is discontinued for sale
There is a free tool available on http://www.microsoft.com/express/vb/default.aspx similar to VB6 but more complete
Otherwise your client will have to buy Visual Studio to see which one can fit them is http://www.microsoft.com/visualstudio/en-us/products/default.mspx
The Express C++ edition included on Visual Studio includes the features of Visual Basic