If you are facing the Extension upgrade issue, please uninstall and install the latest version of corresponding Syncfusion platform extensions. Refer to the below steps.
1. Open Visual Studio.
2. Open Manage Extensions
For Visual Studio 2019: Extensions -> Manage Extensions/Extensions and Updates
For earlier versions of Visual Studio: Tools -> Extensions and Updates
3. Select the Installed tab on the left side and type “Syncfusion” in the search box.
4. Choose Syncfusion Visual Studio extensions and uninstall all the installed extensions
5. To install the required latest version of Syncfusion Visual Studio extension, please follow the blog
If you still facing an issue with extension, please share the log file which created in the temp location.