You might select this option if:
To use this option, download the software from their website. You'll also need an account with Mendeley.
Recommended: Also install the two add-ons, the "Web Importer" and the "Mendeley Cite." These will allow you to 'clip' citations from the web as you browse, and to add in-text citations and bibliographies to documents in Microsoft Word (from your Mendeley library) as you write.
This client cannot work offline- the legacy Mendeley Desktop is the only option for this.
You might prefer this option if:
To use this option, make an account with Mendeley/Elsevier and begin populating references into your library through their website.
Recommended: Also install the "Web Importer," which allows you to clip citations to your library as you browse the internet.