I remember it well. Great free program, but I don't think it runs properly on Win 9x.
I think it came on PC Plus Superdisk in the days when 1.44 Mbytes was plenty. I gave my copy away with my Windows 3.1 computer.
However, I do have a copy of Micrografx Graphics Suite, which includes a copy of ABC Flowcharter, and Snapgrafx 2.0 - the following comes from a readme.txt file on the installation CD
Installing SnapGraphics 2.0
ABC SnapGraphics 2.0 is included in the SNAP20 folder of the ABC Graphics Suite Application CD. To install ABC SnapGraphics 2.0, select Add/Remove Programs in the Control Panel and follow the instructions. You can also run SETUP.EXE from the SNAP20 folder of the Application CD.
ABC SnapGraphics 2.0 is a Windows 3.1 application. Therefore, it can't use Windows 95 features such as long filenames. Some information in Help may apply to Windows 3.1, rather than Windows 95.