Hi Blythe
The disallowing of downloads is a default setting now, as discussed in the link you posted, to prevent malicious use of software. We experienced something similar recently with a client where the default embed widget was disallowing popups to be displayed. Given we are working in a trusted environment, we got around this by creating a custom widget to support the use of the popups. I have modified this code now to set the allow-downloads in the iFrame attributes. Code is attached, as you are using Enterprise 11.1 you should be able to import this in to your Enterprise to be used within ExB. See the details here .
I have included two versions of the widget, one compiled, ready to drop on to the web server and bring in to Enterprise, and the second is the source code of the uncompiled code, just so if you need to modify or change in the future you can, or if you want to scan for your own security purposes. Note, this is pretty much the out of the box widget, with the updated iFrame attributes.
I've not had a chance to test this, but hopefully it works out of the box.
Cheers