By downloading our 3DS Emulator Windows package, you will receive a .EXE installation file. Simply run it and follow the installation steps.
After the program has succesfully installed, the first time you run it the emulator will ask for some configuration settings, after that you are good to go.
The android package is a little different because you will download a .APK file.
When you are on PC, simply copy the .APK file onto a SD-card, put the SD-card into your phone and run the file.
From an android phone you can simply run it instantly.
On the Mac you will receive a .DMG file, the rest of the instructions are the same as for Windows.