windows installer fixes

compilation/package_dist.py

@@ -15,10 +15,24 @@ BUILD_TEMP = os.path.join(ROOT_DIR, "build_temp")
 
 def clean_and_prep():
     if os.path.exists(DIST_DIR):
-        shutil.rmtree(DIST_DIR)
-    os.makedirs(DIST_DIR, exist_ok=True)
+        for item in os.listdir(DIST_DIR):
+            if item == "runtime":
+                continue
+            item_path = os.path.join(DIST_DIR, item)
+            try:
+                if os.path.isdir(item_path):
+                    shutil.rmtree(item_path)
+                else:
+                    os.remove(item_path)
+            except Exception:
+                pass
+    else:
+        os.makedirs(DIST_DIR, exist_ok=True)
     if os.path.exists(BUILD_TEMP):
-        shutil.rmtree(BUILD_TEMP)
+        try:
+            shutil.rmtree(BUILD_TEMP)
+        except Exception:
+            pass
     os.makedirs(BUILD_TEMP, exist_ok=True)