@Misha - be aware that the GhostDoc installation will attempt to install into VS 2026. It reports success, but when I open VS 2026 after the install is finished, I get at least a dozen "activitylog.xml" errors. These are the first few (the CSharp and VB ones repeat a few times).
SetSite failed for package [LegacyProjectSystemRegistrationPackage](null)
SetSite failed for package [LegacyProjectSystemRegistrationPackage]Source: 'Microsoft.VisualStudio.Shell.15.0' Description: The SVsDesignTimeBuildManager service is unavailable.
Microsoft.VisualStudio.Shell.ServiceUnavailableException: The SVsDesignTimeBuildManager service is unavailable.
SetSite failed for package [VisualBasicPackage]Source: 'Microsoft.VisualStudio.Composition' Description: Expected 1 export(s) with contract name "Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.MiscellaneousFilesWorkspace" but found 0 after applying applicable constraints.
Microsoft.VisualStudio.Composition.CompositionFailedException: Expected 1 export(s) with contract name "Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.MiscellaneousFilesWorkspace" but found 0 after applying applicable constraints.
SetSite failed for package [CSharpPackage]Source: 'Microsoft.VisualStudio.Composition' Description: Expected 1 export(s) with contract name "Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.MiscellaneousFilesWorkspace" but found 0 after applying applicable constraints.
Microsoft.VisualStudio.Composition.CompositionFailedException: Expected 1 export(s) with contract name "Microsoft.VisualStudio.LanguageServices.Implementation.ProjectSystem.MiscellaneousFilesWorkspace" but found 0 after applying applicable constraints.