Update to the latest install script

Signed-off-by: Tim Smith <tsmith@chef.io>

files/install.ps1

 # =====================================================================
-# Copyright 2011 - Present RealDimensions Software, LLC, and the
+# Copyright 2017 Chocolatey Software, Inc, and the
+# original authors/contributors from ChocolateyGallery
+# Copyright 2011 - 2017 RealDimensions Software, LLC, and the
 # original authors/contributors from ChocolateyGallery
 # at https://github.com/chocolatey/chocolatey.org
 #
@@ -44,10 +46,14 @@ if ($env:TEMP -eq $null) {
 }
 $chocTempDir = Join-Path $env:TEMP "chocolatey"
 $tempDir = Join-Path $chocTempDir "chocInstall"
-if (![System.IO.Directory]::Exists($tempDir)) {[System.IO.Directory]::CreateDirectory($tempDir)}
+if (![System.IO.Directory]::Exists($tempDir)) {[void][System.IO.Directory]::CreateDirectory($tempDir)}
 $file = Join-Path $tempDir "chocolatey.zip"
 
-# PowerShell v2/3 caches the output stream. Then it throws errors due
# to the FileStream not being what is expected. Fixes "The OS handle's
# position is not what FileStream expected. Do not use a handle
# simultaneously in one FileStream and in Win32 code or another
# FileStream."
+# PowerShell v2/3 caches the output stream. Then it throws errors due
+# to the FileStream not being what is expected. Fixes "The OS handle's
+# position is not what FileStream expected. Do not use a handle
+# simultaneously in one FileStream and in Win32 code or another
+# FileStream."
 function Fix-PowerShellOutputRedirectionBug {
   $poshMajorVerion = $PSVersionTable.PSVersion.Major
 
@@ -179,8 +185,8 @@ $useWindowsCompression = $env:chocolateyUseWindowsCompression
 if ($useWindowsCompression -ne $null -and $useWindowsCompression -eq 'true') {
   Write-Output 'Using built-in compression to unzip'
   $unzipMethod = 'builtin'
-} else {
-  Write-Output "Downloading 7-Zip commandline tool prior to extraction."  
+} elseif (-Not (Test-Path ($7zaExe))) {
+  Write-Output "Downloading 7-Zip commandline tool prior to extraction."
   # download 7zip
   Download-File 'https://chocolatey.org/7za.exe' "$7zaExe"
 }
@@ -244,7 +250,11 @@ Write-Output 'Ensuring chocolatey commands are on the path'
 $chocInstallVariableName = "ChocolateyInstall"
 $chocoPath = [Environment]::GetEnvironmentVariable($chocInstallVariableName)
 if ($chocoPath -eq $null -or $chocoPath -eq '') {
-  $chocoPath = 'C:\ProgramData\Chocolatey'
+  $chocoPath = "$env:ALLUSERSPROFILE\Chocolatey"
+}
+
+if (!(Test-Path ($chocoPath))) {
+  $chocoPath = "$env:SYSTEMDRIVE\ProgramData\Chocolatey"
 }
 
 $chocoExePath = Join-Path $chocoPath 'bin'
@@ -260,10 +270,10 @@ if (![System.IO.Directory]::Exists($chocoPkgDir)) { [System.IO.Directory]::Creat
 Copy-Item "$file" "$nupkg" -Force -ErrorAction SilentlyContinue
 
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@@ -291,45 +301,45 @@ Copy-Item "$file" "$nupkg" -Force -ErrorAction SilentlyContinue
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 # SIG # End signature block