Updated: April 14th 2021, minimal Pro Tools version changed as Auto-Align Post onward is a 64bit only product, provide 32bit in the document.

Auto-Align Post is an offline AAX AudioSuite plug-in.

It will work on Pro Tools 11 or greater, so you can use it with Pro Tools|HD.

For Pro Tools 10 Users:

In order to use Auto-Align Post please make sure you're using the latest 10.3.10 release.

Also, make sure you're using MacOS X 10.7 or newer.

Auto-Align Post 1.1.1 was the last supported release for PT10.

Please refer the document below to download the 32bit version:

Legacy Sound Radix 32bit Plug-Ins