Purchasable from https://cam.store.academia.co.uk/endnote-21-single-research-licence-for-university-owned-computers.html . 

Please note that researchers (including PhD students) in the department require the "Research licence" which is required for use in academic or institutional research, including data analysis and publishing. Researchers are not eligible for the "Teaching/learning" licence, which only applies to use in classroom instruction, student assignments, and curriculum development 

Can be installed on managed Windows workstations.