Hi Kook,
Thank you for reaching out. We have thoroughly reviewed the
issue you reported regarding the package installation. We attempted to install
the Syncfusion.Tools.WPF package and were able to install the package
without any issues.
However, we were able to reproduce the issue you described
when Syncfusion.Shared.WPF is installed at a lower version (26.1.38) already in
the project. Then attempting to install the Syncfusion.Tools.WPF package in
version 26.1.40 afterward, the reported issue occurs.
Root
Cause:
We suspect that Syncfusion.Shared.WPF is installed at a
lower version (26.1.38) in your project already, while Syncfusion.Tools.WPF
requires Syncfusion.Shared.WPF version 26.1.40. This version conflict
causes the installation error.
If you have installed Syncfusion.Shared.WPF at
version 26.1.38 already in your project and then tried to install the Syncfusion.Tools.WPF
package in version 26.1.40, please follow the workaround steps below to resolve
the issue.
Workaround:
To resolve this issue, please update the Syncfusion.Shared.WPF
package to version 26.1.40. You can do this by following these steps:
- Open the Package Manager Console in
Visual Studio.
- Run the following command:
Update-Package Syncfusion.Shared.WPF -Version 26.1.40

- Now, install the Syncfusion.Tools.WPF
package version 26.1.40. It should install without any issues. Run the
following command to install:
Install-Package Syncfusion.Tools.WPF -Version 26.1.40

If you have not installed the Syncfusion.Shared.WPF
package at version 26.1.38 already in your project, but still experiencing this
issue, please provide additional details to investigate the issue further:
- What type of project are you
working on?
- Which platform are you using?
- Please share your project
file and share your package.config file.
- Please share us the NuGet.config
file from below location:
C:\Users\USERNAME\AppData\Roaming\NuGet
- If you have a NuGet.config file
configured with your project, please also share that file.
Regards,
V. Kesavaraman