PowerShell script SCCM 2012 Agent Install - remotely

$CM12MP='MP.contoso.com'
$CMSiteCode='SR1'
$ErrorActionPreference = "SilentlyContinue"
try
{
#Get ccm cache path for later cleanup...
    try
    {
        $ccmcache = ([wmi]"ROOT\ccm\SoftMgmtAgent:CacheConfig.ConfigKey='Cache'").Location
    } catch {}
#download ccmsetup.exe from MP
    $webclient = New-Object System.Net.WebClient
    $url = "http://$($CM12MP)/CCM_Client/ccmsetup.exe"
    $file = "c:\windows\temp\ccmsetup.exe"
    $webclient.DownloadFile($url,$file) 

#download CU2 Patch from MP , must be copied manually to the Client directory.
#$url = "http://$($CM12MP)/CCM_Client/configmgr2012ac-r2-kb2970177-x64.msp"
#$file = "c:\windows\temp\configmgr2012ac-r2-kb2970177-x64.msp"
#$webclient.DownloadFile($url,$file)
#stop the old sms agent service
    stop-service 'ccmexec' -ErrorAction SilentlyContinue
#Cleanup cache
    if($ccmcache -ne $null)
    {
        try
        {
        dir $ccmcache '*' -directory | % { [io.directory]::delete($_.fullname, $true)  } -ErrorAction SilentlyContinue
        } catch {}
    }
#Cleanup Execution History
    Remove-Item -Path 'HKLM:\SOFTWARE\Wow6432Node\Microsoft\SMS\Mobile Client\*' -Recurse -ErrorAction SilentlyContinue
#Cleanup App-V 4.6 Packages
    try
    {
        (get-wmiobject -query "SELECT * FROM Package WHERE SftPath like '%' AND InUse = 'FALSE' " -namespace "root\Microsoft\appvirt\client") | % { start-process -wait sftmime.exe -argumentlist "delete package:$([char]34)$($_.Name)$([char]34) /global" }        
    } catch {}
#kill existing instances of ccmsetup.exe
    $ccm = (Get-Process 'ccmsetup' -ErrorAction SilentlyContinue)
    if($ccm -ne $null)
    {
            $ccm.kill();
    }
#run ccmsetup
if(test-path "c:\windows\temp\configmgr2012ac-r2-kb2970177-x64.msp") {
    $proc = Start-Process -FilePath 'c:\windows\temp\ccmsetup.exe' -PassThru -ArgumentList "Patch=""c:\windows\temp\configmgr2012ac-r2-kb2970177-x64.msp"" /mp:$($CM12MP) /source:http://$($CM12MP)/CCM_Client CCMHTTPPORT=80 RESETKEYINFORMATION=TRUE SMSSITECODE=$($CMSiteCode) SMSSLP=$($CM12MP) FSP=$($CM12MP)"
} else {
    $proc = Start-Process -FilePath 'c:\windows\temp\ccmsetup.exe' -PassThru -ArgumentList "/mp:$($CM12MP) /source:http://$($CM12MP)/CCM_Client CCMHTTPPORT=80 RESETKEYINFORMATION=TRUE SMSSITECODE=$($CMSiteCode) SMSSLP=$($CM12MP) FSP=$($CM12MP)"
} 
    Sleep(5)
    "ccmsetup started..."
}
catch
{
        "an Error occured..."
        $error[0]
}