Sunrise.php

Hello!
We want to install Multi-Domain and have uploaded the first set of files to wp-content/mu-plugins.
However, we are not sure what the next instruction want us to do.

There is sunrise.php on wp-content already. And from what we saw, there is another sunrise.php that came with Multi-Domains.

Do we upload this to wp-content too? And since we are using Domain Mapping, after re-naming dm.sunrise.php, do we upload that one as well too?

Thank You!