Once you purchase the updated installers via PayPal, you'll receive an email with a link. I *enabled* SIP before installing and it worked just fine and AlphaTrack was working great after reboot.
Here's the link and some info from the page:
http://www.synclavier.com/AlphaTrackPlugin.html
A collaboration between Frontier Design Group and Synclavier Digital has created an updated version of the AlphaTrack Driver as well as the Control Surface Plug-in for Digital Performer®.
Version 1.4.1 of the AlphaTrack Driver now includes a signed kernel extension for use with Mac OS 10.9 or later. Two installers are provided, one for Mac OS 10-6 through 10-8 and one for Mac OS 10-9 and later. Each installer places all the required AlphaTrack Driver components on your computer and also installs the Digital Performer® Control Surface Plug-in.
Version 1.02 of the AlphaTrack Control Surface Plug-in for Digital Performer® is built for 32-bit and 64-bit versions of Digital Performer®, including Digital Performer® 8 and 9. It requires Mac OS X 10.6.8 ("Snow Leopard") or later.
We also have an updated driver and plug-in for the Frontier Design Group TranzPort wireless DAW control.
This new version of the AlphaTrack Driver and Control Surface Plug-in for Digital Performer® is available for purchase and download from our Paypal On-Line Store for a cost of US $35.00. A download link is provided in your order confirmation email.