Convert this to batch to powershell

Currently I can run this script and it can tell me that if it is windows 32 or 64 bit.  Can you tell me how to convert to powershell

 
IF EXIST "C:\Program Files (x86)\" ( GOTO OS64 ) ELSE ( GOTO OS32 )

:OS32
QBP.msi /quiet
GOTO ENDA

:OS64
QBP64.msi /quiet

:ENDA
EXIT

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Then when it defines what OS I am going to call on

$Source = "http://source.QBP.msi"
$FileName = Split-Path $Source -Leaf
$Destination = "C:\Temp\$($FileName)"
$Description = "$FileName Download"
$DisplayName = "$FileName Download"

$Job = Start-BitsTransfer -Asynchronous -TransferType Download -Priority Foreground -Description $Description -DisplayName $DisplayName -Destination $Destination -Source $Source
Get-BitsTransfer -JobId $Job.JobId

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There will be a call and then I want it to also install the msi depending upon if it is 32bit or 64bit msi.
sj77Asked:
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oBdAConnect With a Mentor Commented:
You can use something like this:
$msi = If ((Get-WmiObject Win32_OperatingSystem).OSArchitecture -eq '64-bit') {'QBP64.msi'} else {'QBP.msi'} 
Invoke-WebRequest -Uri "http://domain.com/$($msi)" -OutFile "C:\Temp\$($msi)"
msiexec.exe /i "C:\Temp\$($msi)"

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oBdACommented:
This sets $msi to the correct name:
$msi = If ((Get-WmiObject Win32_OperatingSystem).OSArchitecture -eq '64-bit') {'QBP64.msi'} else {'QBP.msi'}

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sj77Author Commented:
So i realize that what I am really wanting is if 32 bit or 64 bit then I need it to download a certain file and then run it.

So how would you write that script?
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sj77Author Commented:
oBdA,

I would like to use BitsTransferr about this so would it look like this,

$msi = If ((Get-WmiObject Win32_OperatingSystem).OSArchitecture -eq '64-bit') {'QBP64.msi'} else {'QBP.msi'} 
Invoke-WebRequest -Uri "http://domain.com/$($msi)" -OutFile "C:\Temp\$($msi)"
$Job = Start-BitsTransfer -Asynchronous -TransferType Download -Priority Foreground -Description $Description -DisplayName $DisplayName -Destination $Destination -Source $Source
Get-BitsTransfer -JobId $Job.JobId

msiexec.exe /i "C:\Temp\$($msi)"

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oBdACommented:
If you're using BitsTransfer, you obviously don't need the Invoke-WebRequest, though I don't see any gains.
And if you're running it asynchronous (why?), you need to take care of the waiting until the file is arrived yourself; Get-BitsTransfer doesn't do that. msiexec then obviously needs to be started with $Destination, not with $msi.
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