Datylon for Illustrator can be installed on two devices with the same Adobe ID and Datylon account.
A Datylon for Illustrator license is personal. It can therefor only be used by one Datylon account (the email address you use to register) and can only be linked to one Adobe ID.
Your individual license lets you install Adobe Illustrator + Datylon plugin on more than one computer, sign in (activate) on two, but use it on only one computer at a time.
This is in line with Adobe's licensing model. See more info at https://helpx.adobe.com/be_en/download-install/using/install-apps-number-of-computers.html