diff --git a/README.md b/README.md
index b01584f..45efa65 100644
--- a/README.md
+++ b/README.md
@@ -45,7 +45,21 @@ sudo xattr -d com.apple.quarantine /usr/local/bin/stakecli
 
 ### Windows
 
-Download the matching `.zip` archive from the
+One-line install in PowerShell (downloads the latest release, installs
+to `%LOCALAPPDATA%\stakecli` and adds it to your user `PATH`):
+
+```powershell
+irm https://raw.githubusercontent.com/mnemoo/cli/main/install.ps1 | iex
+```
+
+Or, to install a specific version:
+
+```powershell
+$env:STAKECLI_VERSION = "v1.0.0"
+irm https://raw.githubusercontent.com/mnemoo/cli/main/install.ps1 | iex
+```
+
+Prefer a manual install? Download the matching `.zip` archive from the
 [latest release](https://github.com/mnemoo/cli/releases/latest) and
 extract `stakecli.exe` somewhere on your `PATH`.
 
diff --git a/install.ps1 b/install.ps1
new file mode 100644
index 0000000..440c9c5
--- /dev/null
+++ b/install.ps1
@@ -0,0 +1,86 @@
+# install.ps1 — Install the latest stakecli release on Windows.
+#
+# Usage (PowerShell):
+#   irm https://raw.githubusercontent.com/mnemoo/cli/main/install.ps1 | iex
+
+[CmdletBinding()]
+param(
+    [string]$Repo    = "mnemoo/cli",
+    [string]$Bin     = "stakecli.exe",
+    [string]$Dest    = (Join-Path $env:LOCALAPPDATA "stakecli"),
+    [string]$Version = $(if ($env:STAKECLI_VERSION) { $env:STAKECLI_VERSION } else { "latest" })
+)
+
+$ErrorActionPreference = "Stop"
+[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12
+
+function Write-Step($msg) { Write-Host "==> $msg" -ForegroundColor Cyan }
+function Write-Ok($msg)   { Write-Host "    $msg" -ForegroundColor Green }
+function Write-Warn2($msg){ Write-Host "    $msg" -ForegroundColor Yellow }
+
+# 1. Detect architecture
+$arch = switch ($env:PROCESSOR_ARCHITECTURE) {
+    "AMD64" { "amd64" }
+    "ARM64" { "arm64" }
+    "x86"   { "386" }
+    default { throw "Unsupported architecture: $env:PROCESSOR_ARCHITECTURE" }
+}
+
+# 2. Resolve release metadata
+$api = if ($Version -eq "latest") {
+    "https://api.github.com/repos/$Repo/releases/latest"
+} else {
+    "https://api.github.com/repos/$Repo/releases/tags/$Version"
+}
+
+Write-Step "Fetching release info ($Version)"
+$release = Invoke-RestMethod -Uri $api -UseBasicParsing
+$tag     = $release.tag_name
+Write-Ok "version: $tag"
+
+# 3. Pick the matching Windows archive
+$asset = $release.assets |
+    Where-Object { $_.name -match "(?i)windows" -and $_.name -match "(?i)$arch" -and $_.name -match "\.zip$" } |
+    Select-Object -First 1
+
+if (-not $asset) {
+    $asset = $release.assets |
+        Where-Object { $_.name -match "(?i)windows" -and $_.name -match "\.zip$" } |
+        Select-Object -First 1
+}
+if (-not $asset) { throw "No Windows .zip asset found in release $tag" }
+
+Write-Step "Downloading $($asset.name)"
+
+# 4. Download and extract into a temp workspace
+$work = Join-Path $env:TEMP "stakecli_install_$([guid]::NewGuid().ToString('N'))"
+New-Item -ItemType Directory -Path $work -Force | Out-Null
+$zip = Join-Path $work $asset.name
+
+try {
+    Invoke-WebRequest -Uri $asset.browser_download_url -OutFile $zip -UseBasicParsing
+    Expand-Archive -Path $zip -DestinationPath $work -Force
+
+    $exe = Get-ChildItem -Path $work -Filter $Bin -Recurse | Select-Object -First 1
+    if (-not $exe) { throw "$Bin not found in archive" }
+
+    # 5. Install
+    New-Item -ItemType Directory -Path $Dest -Force | Out-Null
+    Copy-Item $exe.FullName -Destination $Dest -Force
+    Write-Ok "installed: $(Join-Path $Dest $Bin)"
+} finally {
+    Remove-Item $work -Recurse -Force -ErrorAction SilentlyContinue
+}
+
+# 6. Ensure destination is on user PATH
+$userPath = [Environment]::GetEnvironmentVariable("PATH", "User")
+$parts    = @($userPath -split ";" | Where-Object { $_ })
+if ($parts -notcontains $Dest) {
+    [Environment]::SetEnvironmentVariable("PATH", (($parts + $Dest) -join ";"), "User")
+    Write-Ok "added $Dest to user PATH (restart your terminal to pick it up)"
+} else {
+    Write-Warn2 "$Dest already on PATH"
+}
+
+Write-Host ""
+Write-Host "Done. Open a new terminal and run: stakecli" -ForegroundColor Green