Google Chrome 64.0.3251.0 (Official Build) canary (64-bit) (cohort: 64-Bit)
Windows 10 Enterprise Version 1607 Build 14393.1770
ZoomText Private Beta -  11.7.11.410

# Start ZoomText then Chrome
# Download any file, I downloaded Chrome
# Navigate to the download bar using F6
# Tab through the buttons on the download bar

Button that opens additional options (up arrow) is read as "unnamed button" but functionality still works.