For your NXT or EV3
Accelerometer, Compass & Gyro
Motor Multiplexers & Controllers
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RC Servos, Mountings & Pneumatics

Sensor Kits
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EV3 Console Adapter
EV3 Sensor Adapter for NXT or Arduino
EV3 Compatibility Info

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How to Install NXT-Executables
Run NXT-G and locate button 'NXT Window'
NXT Window button
'NXT Window' is one of the buttons in the button cluster located at bottom right corner of NXT-G window.

Also, ensure that firmware on your NXT is 1.29.

You can find current firmware by powering on NXT brick,
scroll to 'Settings' and then select 'NXT Version'.
The line with 'FW' indicates current firmware version.
Use 'Memory' Tab to upload/download files
Memory TabEnsure to connect NXT to your PC and power it on.
Click on the 'Memory' tab to access NXT file system.

To download files from your computer to NXT -
Click on 'Download' button and
Browse and select the file you wish to download.