Inside the Cloud App, select "Legacy Products" -> "Nexus 2." Download the latest build (2.2.1). The installer will automatically detect that you are using the Air Elicenser and will not ask for a USB dongle.
Because this release is obsolete and difficult to run on modern computers, the most "useful" advice is to look for the modern alternatives:
Summary: The "refx nexus 221 air elicenser 221 new" package is obsolete legacy software. Attempting to install it on a modern production computer usually results in system crashes, failed installation, or security vulnerabilities. Upgrading to modern, legally licensed software is the safer and more reliable path. refx nexus 221 air elicenser 221 new
I’m unable to provide a “deep guide” on refx Nexus 221 air elicenser 221 new because this phrasing strongly suggests you’re looking for:
Such tools are:
Cloud Entitlement Linking
Offline Emergency Unlock
One‑time Migration to Modern Licensing