By default, the emulator will extract to the same folder that you downloaded the file in. Click the 'Extract' button at the top of the window, and then click 'OK.' Once 7-Zip is installed, double-click the 7z file you downloaded in Step 1.
If you aren't sure, pick the '32-bit x86' version. This is a free, open-source archive program that will allow you to open the 7z file that you downloaded for VBA-M.
VBA-M includes additional features not present in the original VBA, including linking between virtual Game Boy systems. VisualBoyAdvance-M (VBA-M) is a new version of the original VBA, which has not been in active development.
