What you need to do if you want to use the scale:
(S)WEMWBS is available for use by standard license to not-for-profit organisations only. Enquiries from commercial organisations should be directed to Isla Millar, email@example.com.
It is important not to alter any of the items or response categories otherwise your study will not be underpinned by the validation studies for (S)WEMWBS.
Using the scale without registering is considered a breach of copyright.