This version of 2016 FARS final file is released on 9/27/2018. 

Starting from 2015 file release, there are two folders, one for national and one for Puerto Rico. 
Starting from 9/27/2018, there are 2 zip files for two different file formats in each folder: SAS and CSV.  NHTSA discontinued supporting for DBF format.
Starting from 2014, Pedestrian and Bicyclist files are included in the file release.
Auxiliary files are included in the SAS, DBF and CSV sets instead of as independent zip files.

9/27/2018: files are released for FARS 2016 final data.
7/7/2017: files are released with FARS 2016 annual data.

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FARS Auxiliary Files
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The FARS Auxiliary files are datasets that are derived from the standard FARS datasets: 
1. Accident -> Acc_Aux
2. Vehicle -> Veh_Aux
3. Person -> Per_Aux
These files are joined by the standard key variables.
Please read the following document for additional details: http://www-nrd.nhtsa.dot.gov/Pubs/811364.pdf
For User Manuals, please go to: ftp://ftp.nhtsa.dot.gov/FARS/FARS-Doc/FARS_Auxiliary_Analytical_User_Manuals.zip
For SAS Format Catalog, please go to: ftp://ftp.nhtsa.dot.gov/FARS/Auxiliary_FARS_Files_Formats