You must have Proteus Design Suite installed and make sure you have MASM32 compiler plugin installed.
As you probably know already, this program is executed in a simulated computer. I developed this for my assembly classes in college.
You don't even need to understand assembly. Just open sequence8086 Proteus executable and click in that nice button called "play". A terminal should pop up, which is where input data is received. All outputs are printed in the small display. That's it!