AX and AXi are NOT the same power supply. The AX is based on a Seasonic Platinum platform. The AXi is a proprietary fully digital unit from Flrextronics.
http://www.corsair.com/us/blog/understanding-the-corsair-digital-axi-series-power-supplies/
As for the Link software not working, go on the Corsair forums and get the newest version. Not to deny that some people may have had some problems, but I for one have never had a problem with the Link software:
http://www.corsair.com/blog/using-corsair-link-to-monitor-a-corsair-ax860i-digital-atxpsus-power-output-temperature-and-fan-speed/
http://www.corsair.com/us/blog/using-a-axi-series-psu-and-corsair-links-power-tab-with-different-configurations-to-determine-power-usage-during-different-tasks/