diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
index 9985027..9478058 100644
--- a/.github/workflows/test.yml
+++ b/.github/workflows/test.yml
@@ -110,3 +110,28 @@ jobs:
         with:
           version: '9.21.0'
           packages: 'Editor X:1.5.0-beta.41+2c6d736c,NATS Server,CSV'
+
+  test-install-path:
+    runs-on: ubuntu-24.04
+    name: Test Install Path Output
+    steps:
+      - name: Checkout
+        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
+      - uses: ./ # Uses an action in the root directory
+        id: setup
+        with:
+          version: '9.32.3'
+      - name: Verify path output is under RUNNER_TEMP and tap is installed there
+        run: |
+          echo "setup path output: '$TAP_PATH'"
+          if [ -z "$TAP_PATH" ]; then
+            echo "::error::path output was not set"
+            exit 1
+          fi
+          case "$TAP_PATH" in
+            "$RUNNER_TEMP"/*) : ;;
+            *) echo "::error::install path is not under RUNNER_TEMP ($RUNNER_TEMP)"; exit 1 ;;
+          esac
+          test -x "$TAP_PATH/tap" || { echo "::error::tap not found at TAP_PATH"; exit 1; }
+          # tap should also be resolvable via PATH (added by core.addPath)
+          tap package list --installed
diff --git a/Readme.md b/Readme.md
index 22ce2c9..e5032fb 100644
--- a/Readme.md
+++ b/Readme.md
@@ -17,3 +17,7 @@ There are a few arguments to help you select the right version of OpenTAP to ins
 - `architecture` - Defaults to the architecture of the runner  
 - `os` - Defaults to the OS of the runner
 - `packages` - a list of additional packages to install. Format: `<name1>:<version1>,<name2>:<version2>`. This option requires `version` to be 9.17 or greater.
+
+## Outputs
+
+The temporary installation directory is available in the environment variable `TAP_PATH`, and prepended to `PATH`
diff --git a/index.js b/index.js
index f9e6a8a..2173fb2 100644
--- a/index.js
+++ b/index.js
@@ -3,14 +3,16 @@ const exec = require("@actions/exec");
 const tc = require("@actions/tool-cache");
 const fs = require("fs");
 const os = require("os");
+const path = require("path");
 
 main().catch((error) => setFailed(error.message));
 
-const INSTALL_DIRS = {
-  linux: "/opt/tap",
-  windows: "C:/Program Files/OpenTAP",
-  macos: "/Users/runner/Library/OpenTAP",
-};
+// Resolve a per-worker installation directory.
+// This resolves conflicts when the same machine is simultaneously installing different OpenTAP images.
+function getInstallDir() {
+  const base = process.env.RUNNER_TEMP || os.tmpdir();
+  return path.join(base, "OpenTAP");
+}
 
 function getArchitecture() {
   // Map Node's os.arch() values to the architecture strings expected by the
@@ -83,13 +85,34 @@ async function extractZip(file, dest) {
   }
 
   try {
-    // Fall back to powershell if unzip is not available. This is the case on e.g. 
-    // the official dotnet 8 SDK docker image, mcr.microsoft.com/dotnet/sdk:8.0 
+    // Fall back to pwsh if unzip is not available. This is the case on e.g. the official dotnet 8 SDK docker image, mcr.microsoft.com/dotnet/sdk:8.0 
     await exec.exec("pwsh", ["-c", `Expand-Archive -Path "${file}" -DestinationPath "${dest}"`])
     return true;
   } catch {
     // ignore
   }
+
+
+  try {
+    // Fall back to powershell if pwsh is not available. This is the case on some Windows machines.
+    let script = `
+$filename = "${file}"
+$dest = "${dest}"
+$ext = [IO.Path]::GetExtension($filename)
+if ($ext -ne ".zip")
+{
+    Move-Item "$filename" "$($filename).zip"
+    $filename = "$($filename).zip"
+}
+Expand-Archive -Path "$filename" -DestinationPath "$dest"
+`;
+
+    await exec.exec("powershell.exe", ["-c", script])
+    return true;
+  } catch {
+    // ignore
+  }
+
   return false
 }
 
@@ -132,8 +155,9 @@ async function main() {
 
     // Extract OpenTAP package
     core.info("Unzipping OpenTAP: " + downloadedFilepath);
-    const destDir = INSTALL_DIRS[platform];
+    const destDir = getInstallDir();
     const settingsDir = destDir + "/Settings/";
+    core.info("Installing OpenTAP to: " + destDir);
     const extracted = await extractZip(downloadedFilepath, destDir);
     if (!extracted) {
       core.setFailed("Unable to extract zip archive.")
@@ -152,6 +176,8 @@ async function main() {
 
     // Add to path env
     core.addPath(destDir);
+    // Some plugins depend on this environment variable being set.
+    core.exportVariable('TAP_PATH', destDir);
 
     // Install packages
     if (core.getInput("packages")) {