Script for only updating shh-agent on Windows. Based on: https://github.com/PowerShell/openssh-portable/blob/latestw_all/contrib/win32/openssh/install-sshd.ps1

install-sshd.ps1

# @manojampalam - authored initial script
# @friism - Fixed issue with invalid SDDL on Set-Acl
# @manojampalam - removed ntrights.exe dependency
# @bingbing8 - removed secedit.exe dependency

$scriptpath = $MyInvocation.MyCommand.Path
$scriptdir = Split-Path $scriptpath

$sshdpath = Join-Path $scriptdir "sshd.exe"
$sshagentpath = Join-Path $scriptdir "ssh-agent.exe"
$etwman = Join-Path $scriptdir "openssh-events.man"

if (-not (Test-Path $sshdpath)) {
    throw "sshd.exe is not present in script path"
}

if (Get-Service sshd -ErrorAction SilentlyContinue) 
{
   Stop-Service sshd
   sc.exe delete sshd 1>$null
}

if (Get-Service ssh-agent -ErrorAction SilentlyContinue) 
{
   Stop-Service ssh-agent
   sc.exe delete ssh-agent 1>$null
}

# unregister etw provider
wevtutil um `"$etwman`"

# adjust provider resource path in instrumentation manifest
[XML]$xml = Get-Content $etwman
$xml.instrumentationManifest.instrumentation.events.provider.resourceFileName = $sshagentpath.ToString()
$xml.instrumentationManifest.instrumentation.events.provider.messageFileName = $sshagentpath.ToString()

$streamWriter = $null
$xmlWriter = $null
try {
    $streamWriter = new-object System.IO.StreamWriter($etwman)
    $xmlWriter = [System.Xml.XmlWriter]::Create($streamWriter)    
    $xml.Save($xmlWriter)
}
finally {
    if($streamWriter) {
        $streamWriter.Close()
    }
}

#register etw provider
wevtutil im `"$etwman`"

$agentDesc = "Agent to hold private keys used for public key authentication."
New-Service -Name ssh-agent -DisplayName "OpenSSH Authentication Agent" -BinaryPathName `"$sshagentpath`" -Description $agentDesc -StartupType Manual | Out-Null
sc.exe sdset ssh-agent "D:(A;;CCLCSWRPWPDTLOCRRC;;;SY)(A;;CCDCLCSWRPWPDTLOCRSDRCWDWO;;;BA)(A;;CCLCSWLOCRRC;;;IU)(A;;CCLCSWLOCRRC;;;SU)(A;;RP;;;AU)"
sc.exe privs ssh-agent SeImpersonatePrivilege

## We comment out these lines in order to only install ssh-agent
# $sshdDesc = "SSH protocol based service to provide secure encrypted communications between two untrusted hosts over an insecure network."
# New-Service -Name sshd -DisplayName "OpenSSH SSH Server" -BinaryPathName `"$sshdpath`" -Description $sshdDesc -StartupType Manual | Out-Null
# sc.exe privs sshd SeAssignPrimaryTokenPrivilege/SeTcbPrivilege/SeBackupPrivilege/SeRestorePrivilege/SeImpersonatePrivilege

Write-Host -ForegroundColor Green "ssh-agent service successfully installed"

Thank you for this, solved my issue.

Thank you for this, solved my issue.

You are welcome, happy it helped!

Just found your comment and this gist. Thanks! It worked!

Just found your comment and this gist. Thanks! It worked!

Nice! Happy to help 👍

Thank you @dbuades solved my issue as well.

Thank you @dbuades solved my issue as well.

Glad it was useful !

this helped me as well, much appreciated!!