Add wget alternative for Windows

Weights were being downloaded with wget, but wget isn't native to Windows. Running the code as it was was failing on wget execution for me. So alternative method was added for working on Windows.

app.py

@@ -6,21 +6,44 @@ import torch
 from basicsr.archs.srvgg_arch import SRVGGNetCompact
 from gfpgan.utils import GFPGANer
 from realesrgan.utils import RealESRGANer
+import urllib.request
 
 os.system("pip freeze")
 # download weights
-if not os.path.exists('realesr-general-x4v3.pth'):
-    os.system("wget https://github.com/xinntao/Real-ESRGAN/releases/download/v0.2.5.0/realesr-general-x4v3.pth -P .")
-if not os.path.exists('GFPGANv1.2.pth'):
-    os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.0/GFPGANv1.2.pth -P .")
-if not os.path.exists('GFPGANv1.3.pth'):
-    os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.0/GFPGANv1.3.pth -P .")
-if not os.path.exists('GFPGANv1.4.pth'):
-    os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.0/GFPGANv1.4.pth -P .")
-if not os.path.exists('RestoreFormer.pth'):
-    os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.4/RestoreFormer.pth -P .")
-if not os.path.exists('CodeFormer.pth'):
-    os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.4/CodeFormer.pth -P .")
+
+def download_file(url, output_path):
+    if not os.path.exists(output_path):
+        print(f"Downloading {output_path}...")
+        urllib.request.urlretrieve(url, output_path)
+
+# Windows doesn't have wget
+if platform.system() == "Windows":
+    if not os.path.exists('realesr-general-x4v3.pth'):
+        download_file("https://github.com/xinntao/Real-ESRGAN/releases/download/v0.2.5.0/realesr-general-x4v3.pth", "realesr-general-x4v3.pth")
+    if not os.path.exists('GFPGANv1.2.pth'):
+        download_file("https://github.com/TencentARC/GFPGAN/releases/download/v1.3.0/GFPGANv1.2.pth", "GFPGANv1.2.pth")
+    if not os.path.exists('GFPGANv1.3.pth'):
+        download_file("https://github.com/TencentARC/GFPGAN/releases/download/v1.3.0/GFPGANv1.3.pth", "GFPGANv1.3.pth")
+    if not os.path.exists('GFPGANv1.4.pth'):
+        download_file("https://github.com/TencentARC/GFPGAN/releases/download/v1.3.0/GFPGANv1.4.pth", "GFPGANv1.4.pth")
+    if not os.path.exists('RestoreFormer.pth'):
+        download_file("https://github.com/TencentARC/GFPGAN/releases/download/v1.3.4/RestoreFormer.pth", "RestoreFormer.pth")
+    if not os.path.exists('CodeFormer.pth'):
+        download_file("https://github.com/TencentARC/GFPGAN/releases/download/v1.3.4/CodeFormer.pth", "CodeFormer.pth")
+else:
+    if not os.path.exists('realesr-general-x4v3.pth'):
+        os.system("wget https://github.com/xinntao/Real-ESRGAN/releases/download/v0.2.5.0/realesr-general-x4v3.pth -P .")
+    if not os.path.exists('GFPGANv1.2.pth'):
+        os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.0/GFPGANv1.2.pth -P .")
+    if not os.path.exists('GFPGANv1.3.pth'):
+        os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.0/GFPGANv1.3.pth -P .")
+    if not os.path.exists('GFPGANv1.4.pth'):
+        os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.0/GFPGANv1.4.pth -P .")
+    if not os.path.exists('RestoreFormer.pth'):
+        os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.4/RestoreFormer.pth -P .")
+    if not os.path.exists('CodeFormer.pth'):
+        os.system("wget https://github.com/TencentARC/GFPGAN/releases/download/v1.3.4/CodeFormer.pth -P .")
+
 
 torch.hub.download_url_to_file(
     'https://upload.wikimedia.org/wikipedia/commons/thumb/a/ab/Abraham_Lincoln_O-77_matte_collodion_print.jpg/1024px-Abraham_Lincoln_O-77_matte_collodion_print.jpg',