To get the update, users will have to download Microsoft’s ‘Upgrade Advisor’ app from the Windows Store. Once the app is downloaded, select on the ‘Enable Windows 10 upgrade’ option and then tap on ‘Next’. The app will then check if your device is eligible for an upgrade or whether an update is required before the update is installed. With the app, users can essentially find out wether their old Lumia device is eligible for an upgrade to the latest Windows 10.
Here is the list: