Thanks, @martyn. That resolved my issue of installing just the MCAClient. Champion!
@tmelville, to install silently, I used the msi. To do this, open the MCAClient-admin.exe file (not installing), navigate to C:\Users\%username%\AppData\Local\Downloaded Installations\MCAClient\ and copy the file from there. Cancel the install and run this command to silently install the msi file:
msiexec /i "MCAClient-admin.msi" /q /norestart
To uninstall: msiexec /x "MCAClient-admin.msi"
Thanks again, @martyn.