Question-and-Answer Resource for the Building Energy Modeling Community
 | 1 | initial version |
Answering my own question (and showing my ignorance of PowerShell/Windows):
There were two things missing in my original script. First, I needed to pass the /S (Silent) flag to automatically accept the defaults, and second I needed to pipe the output to Out-Null so that the install script would wait until the EnergyPlus installation was complete.
Here's the important command:
"& $env:ENERGYPLUS_DOWNLOAD_FILENAME /S | Out-Null"
