VS2019 fails to update

When I click Help->Check for updates I get an error message and no update.

In the dd_installer log I see these messages at the end:

[5d30:0019][2021-05-11T09:25:49] Warning: Failed to deserialize packages[9653]: Specified method is not supported.
[5d30:0019][2021-05-11T09:25:49] Error 0x80131515: Failed to get update details for instance '52eb6591'
at Microsoft.VisualStudio.Setup.PackageFactory.GetPackageType(String type)
at Microsoft.VisualStudio.Setup.Serialization.PackageConverter.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.DeserializeConvertable(JsonConverter converter, JsonReader reader, Type objectType, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.PopulateList(IList list, JsonReader reader, JsonArrayContract contract, JsonProperty containerProperty, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.CreateList(JsonReader reader, Type objectType, JsonContract contract, JsonProperty member, Object existingValue, String id)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.JsonSerializer.Deserialize[T](JsonReader reader)
at Microsoft.VisualStudio.Setup.Serialization.CatalogConverter.ReadJson(JsonReader reader, Type objectType, Object existingValue, JsonSerializer serializer)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.DeserializeConvertable(JsonConverter converter, JsonReader reader, Type objectType, Object existingValue)
at Newtonsoft.Json.Serialization.JsonSerializerInternalReader.Deserialize(JsonReader reader, Type objectType, Boolean checkAdditionalContent)
at Newtonsoft.Json.JsonSerializer.DeserializeInternal(JsonReader reader, Type objectType)
at Newtonsoft.Json.JsonSerializer.Deserialize[T](JsonReader reader)
at Microsoft.VisualStudio.Setup.Serialization.ModelSerializer1.Deserialize(TextReader reader) at Microsoft.VisualStudio.Setup.Manifest1.Parse[M](IServiceProvider services, String path, ModelSerializer`1 serializer)
at Microsoft.VisualStudio.Setup.Catalog.Parse(IServiceProvider services, String path, PartialManifestType defaultType)
at Microsoft.VisualStudio.Setup.Cache.Query.GetUpdateInformationWithOptions(String instanceId, UpdateInformationOptions updateInformationOptions, DependencyComparisonSeed seed)
[5d30:0019][2021-05-11T09:25:49] Warning: Failed to check for update for current instance: Specified method is not supported.
[5d30:0001][2021-05-11T09:25:50] Navigate to Page: Final, Action: None, Mesage: The operation did not complete sucessfully
[5d30:0001][2021-05-11T09:25:50] Navigation requested from UpdateMainPageViewModel to DialogErrorDetailsViewModel
[5d30:000a][2021-05-11T09:25:53] Opening the feedback client.
[5d30:0010][2021-05-11T09:25:53] Creating feedback template
[5d30:0010][2021-05-11T09:25:53] Creating feedback metadata
[5d30:0010][2021-05-11T09:25:53] Writing feedback metadata file to C:\Users\<username>\AppData\Local\Temp\dd_feedback_metadata_20210511092553.json
[5d30:0010][2021-05-11T09:25:53] Starting feedback process C:\Program Files (x86)\Microsoft Visual Studio\Installer\vs_installershell.exe with arguments reportaproblem --config=C:\Users\<username>\AppData\Local\Temp\dd_feedback_metadata_20210511092553.json

Please help!