Hi tech, unfortunately no it won't. Apple made changes to El Capitain that broke MoI version 2.52 and the original version 3.0 release on both El Capitain and Sierra. I have released a MoI version 3.1 update that will run ok there, so you should plan to upgrade to MoI v3 when you do the Sierra update as well.

Also one other note, on Sierra MoI v3.1 can only run from the /Applications folder, not any location as previously. So you need to move it there in order for it to run ok, that's due to changes Apple made in how unsigned applications run.

- Michael