A new version AAG145 is released for the Blackberry Priv on AT&T
Also found an official page linking to the newest available software for different blackberry variants.
The new version AAG153 with the August 5 security patch for AT&T can be fetched here (2GB)
Can be loaded as described here
Note that contrary to what is says by “Open the extracted folder” and execute the batch. I experienced that you need to open a command prompt (with “Run as Administrator”), change to the unzipped folder, and execute – then everything works… (Otherwise it claims that the image is wrong for the device)
(My initial Autoloaded Marshmallow was AAF335 with internal dates 2016-06-03, released 2016-07-13)