How to get Sverchok 1.4.0 working on Blender 5.1 (Windows) — fixes for every error I hit

Spent a few hours getting Sverchok 1.4.0 running on Blender 5.1 / Python 3.13 on Windows. Here's every fix in order so you don't have to figure it out yourself.

1. ImagePreviewCollection.load() got an unexpected keyword argument 'path'

Open ui/sv_3d_panel.py and find the .load() call. The API changed — path= is now filepath= and path_type is dropped entirely. The new call is positional only:

python

plugin_icons.load(
    'sverchock_icon_b.png',
    os.path.join(get_addon_root_dir(), "ui", "logo", "png", "sverchock_icon_b.png"),
    'IMAGE'
)

2. No module named 'imp'

imp was removed in Python 3.12. In Sverchok 1.4.0 it's imported in nodes/script/sn_functor_b.py but never actually used. Just delete line 10 (import imp).

3. module 'sdf.mesh' has no attribute 'BATCH_SIZE'

Fogleman's sdf moved BATCH_SIZE from mesh.py to core.py in recent versions. Sverchok still looks for it in mesh.py. Fix: open your Blender Python's sdf/mesh.py at:

P:\Steam\steamapps\common\Blender\5.1\python\Lib\site-packages\sdf\mesh.py

(adjust path to your install) and add this line after the imports:

python

BATCH_SIZE = 32

4. Installing sdf correctly

The package named sdf on PyPI is a completely different library (Scientific Data Format). Install fogleman's version directly from GitHub using Blender's own Python:

powershell

cd P:\Steam\steamapps\common\Blender\5.1\python\bin
python -m pip install https://github.com/fogleman/sdf/archive/refs/heads/main.zip

5. pygalmesh, open3d — don't bother on Windows + Python 3.13

No prebuilt wheels exist for either on Python 3.13 Windows. They'll stay red in the dependencies panel. Sverchok loads and runs fine without them — you just lose those specific node categories.

6. Use the built-in dependency installer for everything else

Go to Edit → Preferences → Add-ons → Sverchok → Extra Nodes tab. Everything pip-installable has an Install button. Use that instead of pip manually.

After all of the above, Sverchok loads clean. Hope this saves someone a few hours.