If you prefer to have the install.ps1 file already, comment out the download line in the batch file and download the install.ps1 from community.chocolatey.org and save it as install.ps1 next to the installChocolatey.cmd file.
If you prefer to have the install.ps1 file already, comment out the download line in the batch file and download the install.ps1 from community.chocolatey.org and save it as install.ps1 next to the installChocolatey.cmd file.