A: Log into home.eset.com , locate your license, and click "Deactivate" on the old installation, then reactivate on your fresh OS. ✅ Pro Tip: Always keep your License Key in a safe place (e.g., password manager). You can also register a free ESET HOME account to manage all your devices and licenses remotely.
A: License Keys are modern, easier to use, and work with all new versions. Username/Password is older but still accepted – ESET will often convert it automatically.