Yes you can use it for you or your clients. Muse to WordPress is under GPL license like WordPress.
This program is free software; you can redistribute it and/or modify it under the terms of the General Public License.
You can’t distribute Muse to WordPress in a paying solution.
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ACCESS TO ALL WIDGETS & THEMES
(BY MUSE TO WORDPRESS)
You will be free to leave and to continue using the downloaded themes and widgets.
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