fix nunchaku download links for windows

Signed-off-by: Vladimir Mandic <mandic00@live.com>

CHANGELOG.md

@@ -5,6 +5,7 @@
 - **Models**  
   - [Qwen-Image](https://qwenlm.github.io/blog/qwen-image/)  
     new image foundational model with 20B params and using Qwen-2.5 as text-encoder!  
+    available for text-to-image workflows, image-editing workflows will follow soon  
     *note*: this model is almost 2x the size of Flux, quantization and offloading are highly recommended!  
     available via *networks -> models -> reference*  
   - [FLUX.1-Krea-Dev](https://www.krea.ai/blog/flux-krea-open-source-release)  
@@ -61,6 +62,7 @@
   - fix api progress reporting endpoint  
   - fix openvino backend failing to compile  
   - fix nunchaku fallback on unsupported model  
+  - fix nunchaku windows download links  
   - reapply offloading on ipadapter load  
   - api set default script-name  
   - avoid forced gc and rely on thresholds  

modules/mit_nunchaku.py

@@ -51,8 +51,9 @@ def install_nunchaku():
         suffix = 'x86_64' if arch == 'linux' else 'win_amd64'
         url = os.environ.get('NUNCHAKU_COMMAND', None)
         if url is None:
+            arch = f'{arch}_' if arch == 'linux' else ''
             url = f'https://huggingface.co/mit-han-lab/nunchaku/resolve/main/nunchaku-{ver}'
-            url += f'+torch{torch_ver}-cp{python_ver}-cp{python_ver}-{arch}_{suffix}.whl'
+            url += f'+torch{torch_ver}-cp{python_ver}-cp{python_ver}-{arch}{suffix}.whl'
         cmd = f'install --upgrade {url}'
         # pip install https://huggingface.co/mit-han-lab/nunchaku/resolve/main/nunchaku-0.2.0+torch2.6-cp311-cp311-linux_x86_64.whl
         log.debug(f'Nunchaku: install="{url}"')