My problem is that on the NXT units, the only version of the software which supports the Renewable energy/temperature sensors is 2.1, which does not appear to be an upgrade to 2.0, but is instead a education site licence version like the ones I have for NXT 1.0 and EV3. 2 Renewable Energy Kits and Temperature sensors.Site licences for Mindstorms Software 1.0 (NXT) and EV3.