Where is the supporter-themes.php

Dear Sir,

After installed Pro-sites and buddypress,The Daily theme and set up, In Settings, I can't find Supporter (PRO),The install instructions say
Upload supporter-themes.php to wp-content/mu-plugins.
Where is the supporter-themes.php
I check pro-sites,buddypress,and daily themes didn't find supporter-themes.php.
is pro-sites.php in the pro-sites file??, is same ??

I set up blugs-MU,want with daily themes,same like the demo sites,now onlys like blugs-MU.
Thanks!

https://premium.wpmudev.org/project/buddypress-daily-theme/

To install:

1. Install the Supporter plugin as per the installation instructions.

2. Upload supporter-themes.php to wp-content/mu-plugins