On windows, remove file before rewriting it when unzipping.

Author: janpfeifer

pkg/installer/download.go

@@ -12,6 +12,7 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"runtime"
 	"strings"
 
 	"github.com/pkg/errors"
@@ -282,6 +283,18 @@ func extractZipFile(f *zip.File, outputPath string) error {
 		fMode = 0644
 	}
 
+	// On windows, if the file exists and is read-only, remove it first to avoid "access is denied" errors.
+	if runtime.GOOS == "windows" {
+		if _, statErr := os.Stat(outputPath); statErr == nil {
+			// Try to make file writable in case it's read-only
+			if chmodErr := os.Chmod(outputPath, 0666); chmodErr != nil {
+				// Ignore error, try remove anyway
+			}
+			// Remove file to allow overwrite
+			_ = os.Remove(outputPath) // Ignore error: attempt to remove in case it helps
+		}
+	}
+
 	// Create the output file
 	outFile, err := os.OpenFile(outputPath, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, fMode)
 	if err != nil {