diff --git a/src/toolManager/main.py b/src/toolManager/main.py
index e005821de..0141db3e9 100644
--- a/src/toolManager/main.py
+++ b/src/toolManager/main.py
@@ -18,23 +18,21 @@
 except ImportError:
     pass # Will handle gracefully later if missing
 
+from registry import TOOLS, CATEGORIES
+from paths import get_toolmanager_root, get_install_state_path
+from constants import IS_WINDOWS
+from config import ConfigManager
+
 # ==================== CONFIG ====================
-BASE_DIR = Path(__file__).resolve().parent
-INFO_JSON = BASE_DIR / "information.json"
+BASE_DIR = get_toolmanager_root()
+INFO_JSON = get_install_state_path()
 FULL_GUI  = BASE_DIR / "gui_fixed.py"
 PYTHON    = sys.executable
 
-ANALOG_TOOLS  = ["esim", "kicad", "ngspice"]
-DIGITAL_TOOLS = ["esim", "kicad", "ngspice", "ghdl", "verilator", "llvm"]
+ANALOG_TOOLS  = CATEGORIES["analog"]
+DIGITAL_TOOLS = CATEGORIES["digital"]
 
-TOOL_LABELS = {
-    "esim":      "eSim",
-    "kicad":     "KiCad",
-    "ngspice":   "Ngspice",
-    "ghdl":      "GHDL",
-    "verilator": "Verilator",
-    "llvm":      "LLVM",
-}
+TOOL_LABELS = {tid: TOOLS[tid].label for tid in DIGITAL_TOOLS}
 
 TOOL_VERSIONS = {
     "esim":      "2.4",
@@ -68,14 +66,11 @@ def relaunch_as_admin():
 def load_installed_versions():
     versions = {k: "Not installed" for k in TOOL_LABELS}
     try:
-        if INFO_JSON.exists():
-            with open(INFO_JSON) as f:
-                data = json.load(f)
-            for pkg in data.get("important_packages", []):
-                name = pkg.get("package_name", "")
-                ver  = pkg.get("version", "Not installed")
-                if name in versions and ver not in ("", "Not installed"):
-                    versions[name] = ver
+        config = ConfigManager()
+        for tool_id in TOOL_LABELS:
+            state = config.get_tool_state(tool_id)
+            if state and state.get("version", "") not in ("", "Not installed"):
+                versions[tool_id] = state["version"]
     except Exception as e:
         print(f"Could not load version info: {e}")
     return versions
@@ -656,7 +651,7 @@ def _run_uninstall(self, tools, label):
                 subprocess.Popen(
                     [PYTHON, backend, "uninstall", tool, "none"],
                     creationflags=(subprocess.CREATE_NO_WINDOW
-                                   if sys.platform == "win32" else 0)
+                                   if IS_WINDOWS else 0)
                 )
             QMessageBox.information(
                 self, "Uninstall Started",
@@ -669,7 +664,7 @@ def _run_uninstall(self, tools, label):
 
 
 def main():
-    if sys.platform == "win32" and not is_admin():
+    if IS_WINDOWS and not is_admin():
         # Note: We deliberately skip a manual PyQt consent dialog here because
         # Windows will natively prompt the user with a UAC shield anyway.
         relaunch_as_admin()
diff --git a/src/toolManager/tool_manager_windows.py b/src/toolManager/tool_manager_windows.py
index de268df7a..4c035eb21 100644
--- a/src/toolManager/tool_manager_windows.py
+++ b/src/toolManager/tool_manager_windows.py
@@ -22,22 +22,21 @@
 from utils import (
     run_cmd_safe, run_cmd_stream, which, print_status,
     DEFAULT_MSYS2_PATH, DEFAULT_ESIM_DIR, WIN_KICAD_PATHS,
-    WIN_NGSPICE_PATHS, WIN_LLVM_PATHS, get_msys2_bash, 
+    WIN_NGSPICE_PATHS, WIN_LLVM_PATHS, get_msys2_bash,
     get_msys2_mingw_bin, get_msys2_mingw_root
 )
+from constants import IS_WINDOWS
+from paths import get_toolmanager_root, get_install_state_path, get_download_cache_dir
+from config import ConfigManager
 
-if sys.platform == "win32":
+if IS_WINDOWS:
     sys.stdout = io.TextIOWrapper(sys.stdout.buffer, encoding='utf-8', errors='ignore')
     sys.stderr = io.TextIOWrapper(sys.stderr.buffer, encoding='utf-8', errors='ignore')
 
-BASE_DIR = Path(__file__).resolve().parent
-STATE_FILE = BASE_DIR / "information.json"
-BASE_DIR.mkdir(parents=True, exist_ok=True)
-
+BASE_DIR = get_toolmanager_root()
+STATE_FILE = get_install_state_path()
 MSYS2_PATH = DEFAULT_MSYS2_PATH
-
-DOWNLOAD_DIR = BASE_DIR / "Download"
-DOWNLOAD_DIR.mkdir(parents=True, exist_ok=True)
+DOWNLOAD_DIR = get_download_cache_dir()
 
 VERILATOR_VERSIONS = {
     "5.006": "verilator-5.006.7z",
@@ -202,7 +201,7 @@ def _find_ngspice_exe():
     return which("ngspice") or which("ngspice.exe")
 
 def find_llvm_fixed(version=None):
-    if platform.system() == "Windows":
+    if IS_WINDOWS:
         import ctypes
         HWND_BROADCAST = 0xFFFF
         WM_SETTINGCHANGE = 0x001A
@@ -1137,41 +1136,7 @@ def install_verilator(v, upgrade=False):
     except Exception as e:
         print_status("install_failed", str(e)[:50], v)
 
-def read_state():
-    if STATE_FILE.exists():
-        try:
-            with open(STATE_FILE) as f:
-                return json.load(f)
-        except Exception:
-            pass
-    return {"important_packages": []}
-
-def write_state(data):
-    with open(STATE_FILE, "w") as f:
-        json.dump(data, f, indent=4)
-
-def update_state(package_name, version):
-    from datetime import datetime
-    data = read_state()
-    for pkg in data["important_packages"]:
-        if pkg["package_name"] == package_name:
-            pkg["version"] = version
-            pkg["installed_date"] = datetime.now().strftime("%Y-%m-%d %H:%M:%S")
-            write_state(data)
-            return
-    data["important_packages"].append({
-        "package_name": package_name,
-        "version": version,
-        "installed_date": datetime.now().strftime("%Y-%m-%d %H:%M:%S"),
-    })
-    write_state(data)
-
-def get_state_version(package_name):
-    data = read_state()
-    for pkg in data["important_packages"]:
-        if pkg["package_name"] == package_name:
-            return pkg.get("version")
-    return None
+_config = ConfigManager()
 
 
 ESIM_DIR = DEFAULT_ESIM_DIR
@@ -1187,7 +1152,8 @@ def check_esim(target_version):
     ]
     for p in indicators:
         if p.exists():
-            ver = get_state_version("esim") or "unknown"
+            esim_state = _config.get_tool_state("esim")
+            ver = esim_state.get("version", "unknown") if esim_state else "unknown"
             tv  = target_version if target_version != "none" else "latest"
             if tv in ("latest", "none") or tv == ver:
                 print_status("installed", ver, tv)
@@ -1226,7 +1192,7 @@ def install_esim(target_version, upgrade=False):
         time.sleep(20)
         for p in [BASE_DIR / "eSim.bat", BASE_DIR / "src" / "frontEnd" / "Application.py", ESIM_DIR / "eSim.bat", ESIM_DIR / "uninst-eSim.exe"]:
             if p.exists():
-                update_state("esim", display_ver)
+                _config.update_tool_state("esim", display_ver)
                 print(f"[OK] eSim {display_ver} installed")
                 print_status("installed", display_ver, target_version)
                 return
diff --git a/src/toolManager/utils.py b/src/toolManager/utils.py
index 093e5d094..ecb99e9d0 100644
--- a/src/toolManager/utils.py
+++ b/src/toolManager/utils.py
@@ -18,11 +18,8 @@
 import time
 from pathlib import Path
 
-# ==================== CONSTANTS & DEFAULTS ====================
-
-# Default Windows installation paths
-DEFAULT_MSYS2_PATH = Path(r"C:\msys64")
-DEFAULT_ESIM_DIR = Path(r"C:\FOSSEE\eSim")
+from constants import DEFAULT_MSYS2_PATH, DEFAULT_ESIM_DIR
+from platform_utils import subprocess_flags
 
 WIN_KICAD_PATHS = [
     (r"C:\Program Files\KiCad\9.0\bin\kicad.exe", "9"),
@@ -62,14 +59,7 @@ def run_cmd_safe(cmd, timeout=30, cwd=None, env=None):
     Returns the subprocess.CompletedProcess result or None if failed.
     """
     try:
-        if platform.system() == "Windows":
-            startupinfo = subprocess.STARTUPINFO()
-            startupinfo.dwFlags |= subprocess.STARTF_USESHOWWINDOW
-            startupinfo.wShowWindow = subprocess.SW_HIDE
-            creationflags = subprocess.CREATE_NO_WINDOW
-        else:
-            startupinfo = None
-            creationflags = 0
+        flags = subprocess_flags()
         
         result = subprocess.run(
             cmd,
@@ -77,8 +67,8 @@ def run_cmd_safe(cmd, timeout=30, cwd=None, env=None):
             text=True,
             shell=False,
             timeout=timeout,
-            startupinfo=startupinfo,
-            creationflags=creationflags,
+            startupinfo=flags.get("startupinfo"),
+            creationflags=flags.get("creationflags", 0),
             encoding='utf-8',
             errors='ignore',
             cwd=cwd,
@@ -95,14 +85,7 @@ def run_cmd_stream(cmd, timeout=900, cwd=None, env=None):
     Returns a tuple of (returncode, full_output_string).
     """
     try:
-        if platform.system() == "Windows":
-            si = subprocess.STARTUPINFO()
-            si.dwFlags |= subprocess.STARTF_USESHOWWINDOW
-            si.wShowWindow = subprocess.SW_HIDE
-            cf = subprocess.CREATE_NO_WINDOW
-        else:
-            si = None
-            cf = 0
+        flags = subprocess_flags()
 
         proc = subprocess.Popen(
             cmd,
@@ -110,8 +93,8 @@ def run_cmd_stream(cmd, timeout=900, cwd=None, env=None):
             stderr=subprocess.STDOUT,
             text=True,
             shell=False,
-            startupinfo=si,
-            creationflags=cf,
+            startupinfo=flags.get("startupinfo"),
+            creationflags=flags.get("creationflags", 0),
             encoding='utf-8',
             errors='ignore',
             cwd=cwd,