Xpand!2 authorizer won't launch

I've bought an Alesis VI25, which comes with downloads for Ableton Live 9 Lite and Xpand!2. Ableton downloaded and works fine.

There's a problem with Xpand!2, though. It appears to download OK, but the authorizer won't open. It's been downloaded from http://airmusictech.com/download-xpand2/, as instructed by Alesis and when I first went through the process I was sent a serial number by Air Music Tech. So - I can't open the authorizer, can't register with the serial number so can't use Xpand!2. I've tried a fresh download 4 or 5 times but with no luck. Anyone any ideas?

Many thanks!

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