diff --git a/powershell/install.ps1 b/powershell/install.ps1
new file mode 100644
index 0000000..995fa5a
--- /dev/null
+++ b/powershell/install.ps1
@@ -0,0 +1,56 @@
+#!/usr/bin/env pwsh
+
+#################
+# Install pwsh #
+#################
+
+# Every package should define these variables
+$pkg_cmd_name = "pwsh"
+
+$pkg_dst_cmd = "$HOME\.local\opt\pwsh\${pkg_cmd_name}.exe"
+$pkg_dst_bin = "$HOME\.local\opt\pwsh"
+$pkg_dst_dir = "$HOME\.local\opt\pwsh"
+$pkg_dst = "$pkg_dst_dir"
+
+$pkg_src_cmd = "$HOME\.local\opt\pwsh-v$Env:WEBI_VERSION\${pkg_cmd_name}.exe"
+$pkg_src_dir = "$HOME\.local\opt\pwsh-v$Env:WEBI_VERSION"
+$pkg_src = "$pkg_src_dir"
+
+New-Item "$HOME\Downloads\webi" -ItemType Directory -Force | Out-Null
+$pkg_download = "$HOME\Downloads\webi\$Env:WEBI_PKG_FILE"
+
+# Fetch archive
+Invoke-DownloadURL -URL $Env:WEBI_PKG_URL -Path $pkg_download
+
+IF (!(Test-Path -Path "$pkg_src_cmd")) {
+    Push-Location "$HOME\.local\tmp"
+
+    # Remove any leftover tmp cruft
+    Remove-Item -Path "$pkg_src_dir" -Recurse -ErrorAction Ignore | Out-Null
+    Remove-Item -Path "$HOME\.local\tmp\pwsh*" -Recurse -ErrorAction Ignore
+
+    # Unpack archive file into this temporary directory
+    # Windows BSD-tar handles zip. Imagine that.
+    New-Item ".\pwsh-v$Env:WEBI_VERSION" -ItemType Directory -Force | Out-Null
+    Push-Location ".\pwsh-v$Env:WEBI_VERSION"
+    Write-Output "    Unpacking $pkg_download"
+    & tar xf "$pkg_download"
+    Pop-Location
+
+    # Settle unpacked archive into place
+    # TODO if .\pwsh-v$Env:WEBI_VERSION\pwsh*\ exists,
+    # then the nesting of the archive has changed
+    # so move either .\pwsh-v$Env:WEBI_VERSION\pwsh*\
+    # or .\pwsh-v$Env:WEBI_VERSION\ accordingly
+    Move-Item -Path ".\pwsh-v$Env:WEBI_VERSION" -Destination "$pkg_src_dir"
+    Write-Output "    into ${TPath}${pkg_src_dir}${TReset}"
+
+    Pop-Location
+}
+
+Write-Output "    Copying ${TDim}${pkg_src}${TReset}"
+Write-Output "      into ${TPath}${pkg_dst}${TReset}"
+Remove-Item -Path "$pkg_dst" -Recurse -ErrorAction Ignore | Out-Null
+Copy-Item -Path "$pkg_src" -Destination "$pkg_dst" -Recurse
+webi_path_add "$pkg_dst_bin"
+& "$pkg_dst_cmd" -V
diff --git a/pwsh/install.ps1 b/pwsh/install.ps1
new file mode 100644
index 0000000..88d7309
--- /dev/null
+++ b/pwsh/install.ps1
@@ -0,0 +1,5 @@
+#!/bin/pwsh
+
+Write-Output "'pwsh@$Env:WEBI_TAG' is an alias for 'powershell@$Env:WEBI_VERSION'"
+IF ($null -eq $Env:WEBI_HOST -or $Env:WEBI_HOST -eq "") { $Env:WEBI_HOST = "https://webinstall.dev" }
+curl.exe -A MS -fsSL "$Env:WEBI_HOST/powershell@$Env:WEBI_VERSION" | powershell