Can't authorize Twist on OS X El Capitan

After installing Twist, which came with my MPK261, I found that I was never asked to authorize (88 Ensemble and Hybrid installs both prompted me for activation and worked fine with iLok).

I found, which pointed to the direct activator install download for Twist, as Twist shows in my plugin list as installed but not authorized just like in that KB article. When I download and run the Twist authorizer though, it fails to open with this message:

"Twist Authorizer" is damaged and can't be opened. You should move it to the Trash.

It seems like this tool may not work with El Cap. I've tried on two different Macs with the same results. Any thoughts on how I can activate my license?
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