Same problem. Turns out, the following registry entries are missing when using /S:
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Apache Software Foundation\Procrun 2.0\PulseAppServer\Parameters\Start]
"Mode"="jvm"
[HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Apache Software Foundation\Procrun 2.0\PulseAppServer\Parameters\Stop]
"Mode"="jvm"
Even though it’s “not recommended”, it’d be nice if this gets fixed.