Powershell script Argumentlist not working correctly - powershell

Question

I am trying to install a rather oldish application. I am wanting to do it in powershell because I have post install functions that need to be done in powershell
The -argumentlist is not starting all the arguments after the /qn ( silent mode install )
The application starts and proceeds to install unattended in silent mode but ignores all the arguments after /qn. So its installing without any of the parameters I have specified. Is there anything I am doing wrong? Could just be my quotes are in the wrong places. My powershell knowledge is very very rusty
$workingDirectory = (split-path $myinvocation.mycommand.path -parent)
#Installs my application
Start-Process -Filepath "$workingDirectory\application.exe" -ArgumentList "/args /qn reboot=reallysuppress SILENT=yes INSTALLSTANDALONE=0 CENTRALSERVERHOSTNAME=servername CENTRALSERVERPORT=1234 CSUSER=userName /L*V C:\Windows\Temp\install.log"

Answer 1

I'm assuming you ran the .EXE directly with those args to verify their correctness?
If that's the case, try this:
Start-Process -Filepath "$workingDirectory\application.exe" -ArgumentList "/args", "/qn", "reboot=reallysuppress", "SILENT=yes", "INSTALLSTANDALONE=0", "CENTRALSERVERHOSTNAME=servername", "CENTRALSERVERPORT=1234", "CSUSER=userName", "/L*V", "C:\Windows\Temp\install.log"
Or this:
Start-Process -Filepath "$workingDirectory\application.exe" -ArgumentList #("/args", "/qn", "reboot=reallysuppress", "SILENT=yes", "INSTALLSTANDALONE=0", "CENTRALSERVERHOSTNAME=servername", "CENTRALSERVERPORT=1234", "CSUSER=userName", "/L*V", "C:\Windows\Temp\install.log")
Or this:
& "$workingDirectory\application.exe" /args /qn reboot=reallysuppress SILENT=yes INSTALLSTANDALONE=0 CENTRALSERVERHOSTNAME=servername CENTRALSERVERPORT=1234 CSUSER=userName /L*V C:\Windows\Temp\install.log
Alternatively, what happens when you remove the /qn arg?

Answer 2

I ran into a similar issue.
Changed this:
& "$workingDirectory\application.exe" /args /qn reboot=reallysuppress SILENT=yes INSTALLSTANDALONE=0 CENTRALSERVERHOSTNAME=servername CENTRALSERVERPORT=1234 CSUSER=userName /L*V C:\Windows\Temp\install.log
To this:
& "$workingDirectory\application.exe" /qn reboot=reallysuppress SILENT=yes INSTALLSTANDALONE=0 CENTRALSERVERHOSTNAME=servername CENTRALSERVERPORT=1234 CSUSER=userName /L*V C:\Windows\Temp\install.log
Source: https://social.technet.microsoft.com/wiki/contents/articles/7703.powershell-running-executables.aspx