Dell Comand Update doesn't work on Windows 7 x64

I've downloaded and installed latest version of Dell Command Update from but neither GUI nor command line version are working.

If I start GUI version, it simply does nothing. I have .NET framework version 4.8 installed, so it satisfies the requirements (Update requires Microsoft .NET Framework 4.6.1 (or later))

If i start command line version, it fails to download the updates with error:

C:\Program Files (x86)\Dell\CommandUpdate>dcu-cli.exe /scan
Checking for updates...
Checking for application component updates...
Determining available updates...
Check for updates completed
Error while downloading the necessary catalogs.
Execution completed.
The program exited with return code: 500

Log file at C:\ProgramData\Dell\UpdateService\Log\Service.log  shows that there are some SSL connection problems:

[21-05-15 14:23:18] {WindowsManagement.ComputerSystem->INFO} The computer manufacturer is 'Dell'
[21-05-15 14:23:18] {UserSettings.Configuration.Settings->DEBUG} Created settings cache 071298ad-e768-41da-b555-9b8a21660c45;
[21-05-15 14:23:18] {Configuration.ServiceStateMonitor->INFO} Started operation Operation Name = GetApplicableUpdatesData, Owner = DellCommandUpdate, Application Version = 4.1.0, Operation ID = 071298ad-e768-41da-b555-9b8a21660c45
[21-05-15 14:23:18] {Configuration.ServiceStateMonitor->INFO} [5] Current Service State changed from Available to OperationInProgress at 15.05.2021 14:23:18
[21-05-15 14:23:18] {Update.Operations.UpdateOperation->DEBUG} Checking for updates from DellCommandUpdate/4.1.0
[21-05-15 14:23:18] {Update.Operations.UpdateOperation->DEBUG} Enter stage [CheckingUpdatingComponents]
[21-05-15 14:23:18] {Update.Operations.Domain.InventoryDomain->INFO} Using Cached System ID: 0612
[21-05-15 14:23:18] {Update.Operations.Domain.CatalogDomain->INFO} GetSystemCatalogInfo(DellCommandUpdate/4.1.0)
[21-05-15 14:23:18] {Update.Operations.Domain.CatalogDomain->INFO} Dell on-line catalog usage enabled
[21-05-15 14:23:18] {Update.Operations.Domain.CatalogDomain->DEBUG} Getting Index Catalog
[21-05-15 14:23:18] {Update.Operations.Domain.CatalogDomain->DEBUG} Using the existing index catalog, age = 00:03:39.2203175
[21-05-15 14:23:18] {Update.Operations.Domain.CatalogDomain->INFO} Base location Uri: https://downloads.dell.com/
[21-05-15 14:23:18] {Update.Operations.Domain.CatalogDomain->DEBUG} The system catalog does not exist.
[21-05-15 14:23:18] {ServiceShell.Proxy.ProxySelector->INFO} Getting default proxy...
[21-05-15 14:23:18] {ServiceShell.Program->DEBUG} File creation detected - C:\ProgramData\Dell\UpdateService\Temp\BITEC26.tmp
[21-05-15 14:23:18] {Update.Operations.Domain.RemoteFile->DEBUG} The remote URI [https://downloads.dell.com/FOLDER07345087M/1/Optiplex_0612.cab] specified is valid
[21-05-15 14:23:18] {Update.Operations.Domain.RemoteFile->DEBUG} Downloading [https://downloads.dell.com/FOLDER07345087M/1/Optiplex_0612.cab] to [C:\ProgramData\Dell\UpdateService\Temp\Optiplex_0612.cab]. NoProgressTimeout [30] MinimumRetryDelay [60]
[21-05-15 14:23:18] {Configuration.ServiceStateMonitor->DEBUG} {v2.1.0.22} HB #5
[21-05-15 14:23:19] {Update.Operations.Domain.RemoteFile->ERROR} Ошибка поддержки безопасных каналов

[21-05-15 14:23:19] {Update.Operations.Domain.RemoteFile->INFO} Download incomplete.
[21-05-15 14:23:19] {Update.Operations.Domain.CatalogDomain->WARN} Catalog download failed [https://downloads.dell.com/FOLDER07345087M/1/Optiplex_0612.cab]
[21-05-15 14:23:19] {Update.Operations.UpdateOperation->DEBUG} Stage [CheckingUpdatingComponents] complete
[21-05-15 14:23:19] {Update.Operations.UpdateOperation->DEBUG} Enter stage [CheckingForUpdates]
[21-05-15 14:23:19] {Update.Operations.UpdateOperation->DEBUG} Stage [CheckingForUpdates] complete
[21-05-15 14:23:19] {Update.Operations.GetPdkUpdates->INFO} 0 updates after initial scan.
[21-05-15 14:23:19] {Update.Operations.UpdateOperation->INFO} There are [0] updates
[21-05-15 14:23:19] {Update.Operations.GetPdkUpdates->INFO} Completed GetPdkUpdates operation with return code DOWNLOAD_ERROR

Could you please tell me how can these ssl errors be fixed?

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