Download keeps retrying for this Adobe bulletin although was able to pull down APSB16-25 just fine today. When it does retry and I see the FTP URL, I'm able to get to it via Windows Explorer so not sure what's going on. Anyone else notice this problem?
Which version are you using? Check out this article: http://www.symantec.com/docs/TECH234062 Most of the time I've seen this, it was an active ftp issue (not allowed to). There is also a workaround for that issue described here: http://www.symantec.com/docs/INFO2742
Not sure if problem was on Adobe or Symantec's end but I was able to download APSB16-26 just fine today!
Symantec has changed the download url from ftp to http, I think that's because now it's working for you. Next time a new download with ftp url will come, it will still not work for you.