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You refer to the “supporter plugin” here:
https://wpmudev.com/project/buddypress-colour-pack/#usage
where it says:
As Super Admin user on WordPress Multisite you have the choice to enable:
The theme network wide so that all users can use the theme.
Enable access to the theme on a per site basis.
Use Supporter plugin via supporter-themes.php to make it available as a premium theme for supporter sites only
Hope it helps. Thanks for ll the great plugins and support!