Links:Infopath is no longer included in Office after 2013; the 2013 version will be suppored through 2026.
It can be downloaded here:
I am grateful to eddiejackson.net for tips that got me started.
It comes as a self-extracting Microsoft CAB archive.
This works for a silent install:
However, there is no way to accept the EULA, thus defeating the point of a silent install.
So, you'll need to extract it. Use the self-extracter (/extract), not something like 7-Zip. The self-extractor puts the proper files in the proper subfolders; otherwise the installer will be unable to find them.
For a silent install, you'll need a config.xml. It lives in \x86\infopath.ww. You can leave it there or copy it elsewhere, but if you copy it elsewhere you'll need to specify the path. I believe the Office Customization Tool would also work but didn't try it.
32\SW_DVD5_InfoPath_2013w_SP1_32-BIT_X64_English_MLF_X19-35218\setup.exe /config config.xml
Note that setup.exe launches, spawns a handful of msiexecs, and then closes. So if you're running the above in a script it will exit successfully before the install is actually done.
Setup Type: Windows Installer (Delivered as an EXE)
Deployment Method Used: Vendor Provided Command Line (answer file driven)