Fix: Windows decompression and installation paths.

src/cli.ts

@@ -94,17 +94,21 @@ Options:
     if (values['install-path']) {
       installDir = path.resolve(values['install-path']);
     } else {
-      const isRoot = process.getuid && process.getuid() === 0;
-
-      if (isRoot) {
-        installDir = '/usr/local/bin';
+      if (process.platform === 'win32') {
+        const localAppData = process.env.LOCALAPPDATA || path.join(os.homedir(), 'AppData', 'Local');
+        installDir = path.join(localAppData, 'bin');
       } else {
-        const homeBin = path.join(os.homedir(), 'bin');
-        if (fs.existsSync(homeBin)) {
-          installDir = homeBin;
-        } else {
-          // Fallback or error? Let's use a local bin if possible or /usr/local/bin (might fail)
+        const isRoot = process.getuid && process.getuid() === 0;
+
+        if (isRoot) {
           installDir = '/usr/local/bin';
+        } else {
+          const homeBin = path.join(os.homedir(), 'bin');
+          if (fs.existsSync(homeBin)) {
+            installDir = homeBin;
+          } else {
+            installDir = '/usr/local/bin';
+          }
         }
       }
     }
@@ -117,7 +121,17 @@ Options:
     const destPath = path.join(installDir, finalName);
 
     console.log(`Installing ${finalName} to ${destPath}...`);
-    fs.copyFileSync(binaryPath, destPath);
+    try {
+      fs.copyFileSync(binaryPath, destPath);
+    } catch (err: any) {
+      if (err.code === 'EBUSY') {
+        throw new Error(`The file ${destPath} is currently in use. Please close any running instances and try again.`);
+      }
+      if (err.code === 'EACCES' || err.code === 'EPERM') {
+        throw new Error(`Permission denied while installing to ${destPath}. Try running with sudo or as administrator, or use -p to specify a custom path.`);
+      }
+      throw err;
+    }
     
     if (process.platform !== 'win32') {
       fs.chmodSync(destPath, '755');

src/core/extractor.ts

@@ -18,11 +18,23 @@ export async function extractAsset(filePath: string, destDir: string): Promise<v
     }
   } else if (name.endsWith('.zip')) {
     if (process.platform === 'win32') {
-      const command = `Expand-Archive -Path "${filePath}" -DestinationPath "${destDir}" -Force`;
-      const result = spawnSync('powershell', ['-Command', command]);
-      if (result.status !== 0) {
-        throw new Error(`powershell Expand-Archive failed with status ${result.status}: ${result.stderr.toString()}`);
+      // Modern Windows 10/11 has tar that handles zip
+      const tarResult = spawnSync('tar', ['-xf', filePath, '-C', destDir]);
+      if (tarResult.status === 0) return;
+
+      // Fallback: Use .NET ZipFile class to bypass PowerShell module trust issues (Microsoft.PowerShell.Archive)
+      // We escape single quotes for PowerShell.
+      const escapedFilePath = filePath.replace(/'/g, "''");
+      const escapedDestDir = destDir.replace(/'/g, "''");
+      const dotNetCommand = `Add-Type -AssemblyName System.IO.Compression.FileSystem; [System.IO.Compression.ZipFile]::ExtractToDirectory('${escapedFilePath}', '${escapedDestDir}')`;
+
+      // Try pwsh (PowerShell 7) then powershell (Windows PowerShell)
+      for (const shell of ['pwsh', 'powershell']) {
+        const result = spawnSync(shell, ['-NoProfile', '-ExecutionPolicy', 'Bypass', '-Command', dotNetCommand]);
+        if (result.status === 0) return;
       }
+
+      throw new Error(`Extraction failed: Both tar and PowerShell fallback failed. Make sure your system can extract ZIP files.`);
     } else {
       const result = spawnSync('unzip', ['-q', filePath, '-d', destDir]);
       if (result.status !== 0) {