Currently downloading through the DST FanMail website does not work properly with Internet Explorer 11 (and Compatibility View does not solve it). If you use DST Fanmail to download your alternative investments and 529 plans, etc, you should postpone upgrading to Explorer 11.
The folks at Fanmail are aware of this problem and expect to have a solution soon.
If you are not running Windows 8 and have already upgraded to Internet Explorer 11, you can uninstall it and reinstall an older version.
If you’re not feeling adventurous, you can retrieve your DST Fanmail files, but you must download them one at a time.
Since using Chrome and/or Firefox with DST Fanmail also require downloading data files one by one, maybe when DST solves the IE11 issue, they will open the door to using Firefox of Chrome.