Chocolatey doesn't install

Question

Following the steps to install Chocolatey via Powershell doesn't work on my Windows 7 64bit PC. I'm following https://chocolatey.org/install#install-from-powershell-v3

• I have confirmed the ExecutionPolicy and that system path has Powershell;

  PS C:\Users\a> Get-ExecutionPolicy
  AllSigned
  
  PS C:\Users\a> ($env:Path).split(';')
  %SystemRoot%\system32\WindowsPowerShell\v1.0\
  C:\Program Files (x86)\NVIDIA Corporation\PhysX\Common
  C:\Program Files (x86)\Intel\iCLS Client\
  C:\Program Files\Intel\iCLS Client\
  C:\ProgramData\Oracle\Java\javapath
  C:\Windows\system32
  C:\Windows
  C:\Windows\System32\Wbem
  C:\Windows\System32\WindowsPowerShell\v1.0\
  C:\Program Files\Java\jre1.8.0_40\bin
  C:\Program Files\Java\jdk1.8.0_40\bin
  C:\Program Files (x86)\AMD\ATI.ACE\Core-Static
  C:\Windows\System32\WindowsPowerShell\v1.0\
  C:\Program Files\Intel\Intel(R) Management Engine Components\DAL
  C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\DAL
  C:\Program Files\Intel\Intel(R) Management Engine Components\IPT
  C:\Program Files (x86)\Intel\Intel(R) Management Engine Components\IPT
  C:\HashiCorp\Vagrant\bin
  C:\Program Files (x86)\Git\bin
  C:\Program Files (x86)\Skype\Phone\
  C:\Program Files (x86)\Git\bin
  C:\Program Files (x86)\Git\libexec\git-core
  
  C:\Program Files (x86)\Nmap
  C:\Program Files\smartmontools\bin
  

• Here are my error messages;

  PS C:\Users\a> iwr https://chocolatey.org/install.ps1 -UseBasicParsing | iex
  ???# : The term '???#' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
  At line:1 char:1
  + ???# =====================================================================
  + ~~~~
      + CategoryInfo          : ObjectNotFound: (???#:String) [], CommandNotFoundException
      + FullyQualifiedErrorId : CommandNotFoundException
  
  Getting latest version of the Chocolatey package for download.
  Getting Chocolatey from https://chocolatey.org/api/v2/package/chocolatey/0.10.5.
  !Test-Path : The term '!Test-Path' is not recognized as the name of a cmdlet, function, script file, or operable program. Check the spelling of the name, or if a path was included, verify that the path is correct and try again.
  At line:188 char:11
  + } elseif (!Test-Path $7zaExe) {
  +           ~~~~~~~~~~
      + CategoryInfo          : ObjectNotFound: (!Test-Path:String) [], CommandNotFoundException
      + FullyQualifiedErrorId : CommandNotFoundException
  
  Extracting C:\Users\a\AppData\Local\Temp\chocolatey\chocInstall\chocolatey.zip to C:\Users\a\AppData\Local\Temp\chocolatey\chocInstall...
  Exception calling "Start" with "0" argument(s): "The system cannot find the file specified"
  At line:211 char:3
  +   $process.Start() | Out-Null
  +   ~~~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
      + FullyQualifiedErrorId : Win32Exception
  
  Exception calling "BeginOutputReadLine" with "0" argument(s): "StandardOut has not been redirected or the process hasn't started yet."
  At line:212 char:3
  +   $process.BeginOutputReadLine()
  +   ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
      + FullyQualifiedErrorId : InvalidOperationException
  
  Exception calling "WaitForExit" with "0" argument(s): "No process is associated with this object."
  At line:213 char:3
  +   $process.WaitForExit()
  +   ~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : NotSpecified: (:) [], MethodInvocationException
      + FullyQualifiedErrorId : InvalidOperationException
  
  Unable to unzip package using 7zip. Perhaps try setting $env:chocolateyUseWindowsCompression = 'true' and call install again. Error: 7-Zip signalled an unknown error (code )
  At line:225 char:15
  +     default { throw "$errorMessage 7-Zip signalled an unknown error (code $exitC ...
  +               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
      + CategoryInfo          : OperationStopped: (Unable to unzip...n error (code ):String) [], RuntimeException
      + FullyQualifiedErrorId : Unable to unzip package using 7zip. Perhaps try setting $env:chocolateyUseWindowsCompression = 'true' and call install again. Error: 7-Zip signalled an unknown error (code )
  

• I have tried the error messages suggestion on the last line

  Perhaps try setting $env:chocolateyUseWindowsCompression = 'true'
  

  But that only results in a whole series of other errors

Answer 1

PS C:\admin\scripts> iwr https://chocolatey.org/install.ps1 -UseBasicParsing


StatusCode        : 200
StatusDescription : OK
Content           : # =====================================================================
...

You're downloading a UTF-8-encoded file (the content begins with the characteristic UTF-8 byte order mark ), but it's being treated as ASCII text.

Besides:

I'm following https://chocolatey.org/install#install-from-powershell-v3.

No, you're not. The website you referenced tells you to use

iex ((New-Object System.Net.WebClient).DownloadString('https://chocolatey.org/install.ps1'))

which works as advertised, whereas you're trying to use

iwr https://chocolatey.org/install.ps1 -UseBasicParsing | iex

If you want to use that approach you need to remove the BOM from the content before piping it into Invoke-Expression:

(iwr https://chocolatey.org/install.ps1 -UseBasicParsing).Content -replace '^' | iex