From what I understand, Bloomberg Open Symbology is now transitioning to OpenFigi:
"BSYM.bloomberg.com will be SHUT-OFF on June 1st. It is being replaced by OpenFIGI.com."
You could download a precanned file from BSYM (from http://bdn-ak.bloomberg.com/precanned/...) however it seems that URL no longer has new files as of 6/9/2016.
Does OpenFIGI have a similar precanned file URL? (I know they have an API but I'm interested in the precanned file.)