This wont work in CMD.EXE because of the double quotes around Servername. (InstallShield gets confused):
HPDisplayService_v1.1.10.exe /s /v"/qn HPSERVER="Servername" SECURECONN=0"
This WILL work in CMD but NOT PowerShell (or PSADT):
HPDisplayService_v1.1.10.exe /s /v"/qn HPSERVER=\"Servername\" SECURECONN=0"
This WILL work in PowerShell but you will not get logging or error handling of PSADT:
HPDisplayService_v1.1.10.exe /s /v"/qn HPSERVER=\“Servername`” SECURECONN=0"`
This will work in PSADT:
Execute-Process -Path "$dirFiles\HPDisplayService_v1.1.10.exe" -Parameters "/s /v`"/qn HPSERVER=\`"Servername\`" SECURECONN=0`""
This will also work in PSADT and tell InstallShield to create a log file:
Execute-Process -Path "$dirFiles\HPDisplayService_v1.1.10.exe" -Parameters "/s /v`"ALLUSERS=1 /qn /L* \`"$configToolkitLogDir\HPDisplayService_v1.1.10.log\`"`""
And this tries to explain how all the escaping quotes non-sense:
