diff --git a/.github/workflows/tests.yml b/.github/workflows/tests.yml
index 716cc079..377cdaef 100644
--- a/.github/workflows/tests.yml
+++ b/.github/workflows/tests.yml
@@ -25,8 +25,6 @@ jobs:
         run: go tool golangci-lint run --timeout=5m
       - name: Unit Tests
         run: make test
-      - name: Install Tests
-        run: make test-install
       - name: Upload coverage to Codecov
         uses: codecov/codecov-action@fb8b3582c8e4def4969c97caa2f19720cb33a72f # v7.0.0
         with:
@@ -34,6 +32,30 @@ jobs:
           files: ./coverage.out
           fail_ci_if_error: false
 
+  install-tests:
+    name: Install Tests
+    strategy:
+      fail-fast: false
+      matrix:
+        os:
+          - macos-latest
+          - ubuntu-latest
+          - windows-latest
+    runs-on: ${{ matrix.os }}
+    permissions:
+      contents: read
+    steps:
+      - uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
+        with:
+          persist-credentials: false
+      - name: Install Tests (Unix)
+        if: runner.os != 'Windows'
+        run: make test-install
+      - name: Install Tests (Windows)
+        if: runner.os == 'Windows'
+        shell: pwsh
+        run: ./scripts/install-windows-test.ps1
+
   # Monitor code coverage and TODO/FIXME-type comments
   health-score:
     name: Health Score
diff --git a/scripts/install-windows-dev.ps1 b/scripts/install-windows-dev.ps1
index e24cfd22..b389c23a 100644
--- a/scripts/install-windows-dev.ps1
+++ b/scripts/install-windows-dev.ps1
@@ -163,7 +163,7 @@ function install_slack_cli {
   $slack_cli_new_binary_path = "$($slack_cli_dir)\bin\${confirmed_alias}.exe"
 
   delay 0.3 "Extracting the executable to:`n   $slack_cli_new_binary_path"
-  Expand-Archive "$($slack_cli_dir)\slack_cli.zip" -DestinationPath "$($slack_cli_dir)" -Force
+  Microsoft.PowerShell.Archive\Expand-Archive "$($slack_cli_dir)\slack_cli.zip" -DestinationPath "$($slack_cli_dir)" -Force
   Move-Item -Path $slack_cli_binary_path -Destination $slack_cli_new_binary_path -Force
 
   $User = [System.EnvironmentVariableTarget]::User
diff --git a/scripts/install-windows-test.ps1 b/scripts/install-windows-test.ps1
new file mode 100644
index 00000000..d5b6e11f
--- /dev/null
+++ b/scripts/install-windows-test.ps1
@@ -0,0 +1,76 @@
+# Copyright 2022-2026 Salesforce, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+$ErrorActionPreference = "Stop"
+
+$qualifiedCommand = "Microsoft.PowerShell.Archive\Expand-Archive" # https://github.com/slackapi/slack-cli/issues/651
+$installDir = Join-Path $env:LOCALAPPDATA "slack-cli"
+
+$cases = @(
+  @{ Installer = "install-windows.ps1"; Alias = "slack-test"; Version = "4.6.0"; ExpectVersion = $true },
+  @{ Installer = "install-windows-dev.ps1"; Alias = "slack-dev-test"; Version = "dev"; ExpectVersion = $false }
+)
+
+function Remove-Install {
+  if (Test-Path -LiteralPath $installDir) {
+    Remove-Item -LiteralPath $installDir -Recurse -Force
+  }
+}
+
+foreach ($case in $cases) {
+  $installer = Join-Path $PSScriptRoot $case.Installer
+  $aliasBinary = Join-Path $installDir "bin\$($case.Alias).exe"
+
+  $tokens = $null
+  $parseErrors = $null
+  $ast = [System.Management.Automation.Language.Parser]::ParseFile(
+    $installer,
+    [ref]$tokens,
+    [ref]$parseErrors
+  )
+
+  if ($parseErrors.Count -gt 0) {
+    throw "PowerShell parser errors in $installer"
+  }
+
+  $archiveCommands = $ast.FindAll({
+      param($node)
+      $node -is [System.Management.Automation.Language.CommandAst] -and
+        $node.GetCommandName() -like "*Expand-Archive"
+    }, $true)
+
+  if ($archiveCommands.Count -ne 1 -or $archiveCommands[0].GetCommandName() -ne $qualifiedCommand) {
+    throw "$installer must call $qualifiedCommand exactly once"
+  }
+
+  try {
+    Remove-Install
+
+    & $installer -Alias $case.Alias -Version $case.Version -SkipGit $true
+
+    if (!(Test-Path -LiteralPath $aliasBinary)) {
+      throw "$($case.Installer) did not place $($case.Alias).exe at $aliasBinary (extraction failed?)"
+    }
+
+    $versionOutput = & $aliasBinary --version
+    if ($case.ExpectVersion -and $versionOutput -notmatch [regex]::Escape($case.Version)) {
+      throw "Version mismatch: expected '$($case.Version)' in output, got '$versionOutput'"
+    }
+
+    Write-Host "$($case.Installer) E2E passed: $($case.Alias).exe installed, version '$versionOutput'"
+  }
+  finally {
+    Remove-Install
+  }
+}
diff --git a/scripts/install-windows.ps1 b/scripts/install-windows.ps1
index 63f6d70a..aa648390 100644
--- a/scripts/install-windows.ps1
+++ b/scripts/install-windows.ps1
@@ -154,7 +154,7 @@ function install_slack_cli {
   $slack_cli_new_binary_path = "$($slack_cli_dir)\bin\${confirmed_alias}.exe"
 
   delay 0.3 "Extracting the executable to:`n   $slack_cli_new_binary_path"
-  Expand-Archive "$($slack_cli_dir)\slack_cli.zip" -DestinationPath "$($slack_cli_dir)" -Force
+  Microsoft.PowerShell.Archive\Expand-Archive "$($slack_cli_dir)\slack_cli.zip" -DestinationPath "$($slack_cli_dir)" -Force
   Move-Item -Path $slack_cli_binary_path -Destination $slack_cli_new_binary_path -Force
 
   $User = [System.EnvironmentVariableTarget]::User