Subnet calculator stopped working (crash)

[RafalNiewinski]

Application crash when subnet calculation invoked.
Looks like missing library.

I'm not sure if this is an application problem because I think System.Net.IPNetwork should be normally available in clean .NET installation but I am also pretty sure that it worked before I updated NETworkManager.

Steps to reproduce the issue:

1. Open subnet calculator
2. Make calculation

NETworkManager version: 2026.7.16

• Portable

Windows version (like 10.0.x.x): 11 23H2

.NET version (like 6.0.x): 10.0.10

Application log

FATAL NETworkManager.App - Exception raised by: System.IO.FileNotFoundException: Could not load file or assembly 'System.Net.IPNetwork, Version=3.2.0.0, Culture=neutral, PublicKeyToken=717343cc2c25edcf'. File name: 'System.Net.IPNetwork, Version=3.2.0.0, Culture=neutral, PublicKeyToken=717343cc2c25edcf' at NETworkManager.ViewModels.SubnetCalculatorCalculatorViewModel.Calculate() at NETworkManager.ViewModels.SubnetCalculatorCalculatorViewModel.Calculate() at NETworkManager.ViewModels.SubnetCalculatorCalculatorViewModel.CalculateAction()

[BornToBeRoot]

I can't reproduce it locally. The Subnet Calculator is using (https://github.com/lduchosal/ipnetwork). There was a conflict in the past when Microsoft added it's own System.Net.IPNetwork with .NET 8 - but this was resolved when migrating from .NET 6 -> 8.

Can you try to run a portable version on this system?
https://github.com/BornToBeRoot/NETworkManager/releases/download/2026.7.16.0/NETworkManager_2026.7.16.0_Portable.zip

I assume there might be an old reference - maybe you could also try to uninstall NETworkManager and check if anything is still in the Program Files folder.

Edit: It's also working in a sanbox environment for me. I use 24H2.

[RafalNiewinski]

Thank you for your time.

Portable version works fine.
Next I done the same action inside installed version and it crashed.
I uninstalled .msi version and nothing was left inside installation folder (only empty dir).
Finally I installed from .msi file (the same I used today in a morning to update) and now it works as expected.

DUNNO what was that...