Update reference-design.md

Author: microbit-mark

hardware/reference-design.md

@@ -104,7 +104,7 @@ The reference design uses the same ICs as the micro:bit itself, so to avoid dupl
 The reference design is provided in formats that can be loaded and used in:
 
 - [Altium](http://www.altium.com/)
-- [Eagle Express/Maker/Educational](http://cadsoft.io/pricing/)
+- [Eagle Express/Maker/Educational](https://www.autodesk.com/products/eagle/overview)
 - [KiCad EDA](http://kicad-pcb.org/)
 
 Currently, the design is 'Altium First' and we would appreciate any support or expertise around improving the conversion to KiCad and Eagle formats.