'Upgrade DevExtreme Resources' menu item is unavailable
If the Upgrade DevExtreme Resources menu item is missing, try the following fixes:
Check that the
DevExtreme.AspNet.Core
package version in the project is older than the DevExtreme version installed on your PC. If not, downgrade the DevExtreme.AspNet.Core NuGet package.If the first solution didn’t help, delete the DevExtreme.AspNet.Core NuGet package and client resources.
If the suggestions above did not enable the Upgrade DevExtreme Resources item, manually update all the resources. Review the following topic for more information: Upgrade to a new version.