Error restoring AdventureWorks2016_EXT.bak and AdventureWorksDW2016_EXT.bak

Best regards,
I downloaded the AdventureWorks2016_EXT.bak and AdventureWorksDW2016_EXT.bak files. However, when trying to restore the backups, they are blocked by 35% and generate the following error message, and then appear in the object explorer in Suspect state:

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Restore of database 'AdventureWorks2016_EXT' failed. (Microsoft.SqlServer.Management.RelationalEngineTasks)

Program Location:
   at Microsoft.SqlServer.Management.RelationalEngineTasks.RestoreDatabaseTaskFormComponent.PerformTask (ITaskExecutionContext context)
   at Microsoft.SqlServer.Management.RelationalEngineTasks.RestoreDatabaseTaskFormComponent.Perform (ITaskExecutionContext context)
   at Microsoft.SqlServer.Management.TaskForms.TaskExecutionManager.ExecuteTaskSequence (ISfcScriptCollector collector)

An exception occurred while executing a Transact-SQL statement or batch. (Microsoft.SqlServer.SmoExtended)

Program Location:
   at Microsoft.SqlServer.Management.Smo.RestorePlan.Execute ()
   at Microsoft.SqlServer.Management.RelationalEngineTasks.RestoreDatabaseTaskFormComponent.PerformTask (ITaskExecutionContext context)

An error occurred during recovery, preventing the database 'AdventureWorks2016_EXT' (11: 0) from restarting. Diagnose the recovery errors and fix them, or restore from a known good backup. If errors are not corrected or expected, contact Technical Support. (.Net SqlClient Data Provider)

For help, click: http://go.microsoft.com/fwlink?ProdName=Microsoft%20SQL%20Server&EvtSrc=MSSQLServer&EvtID=3414&LinkId=20476

Server Name: C-JRAMIRJA3
Error Number: 3414
Severity: 21
State: 4
Line Number: 1

Program Location:
   at Microsoft.SqlServer.Management.Common.ConnectionManager.ExecuteTSql (ExecuteTSqlAction action, Object execObject, DataSet fillDataSet, Boolean catchException)
   at Microsoft.SqlServer.Management.Common.ServerConnection.ExecuteNonQuery (String sqlCommand, ExecutionTypes executionType, Boolean retry)

The files that are not extended, AdventureWorks2016.bak and AdventureWorksDW2016.bak, are restored without problems.

Could you please help me by focusing on the solution?

Start by reproducing the restore of AdventureWorks2016_EXT.bak and AdventureWorksDW2016_EXT.bak in SQL Server and inspect the recovery errors associated with error 3414. Compare the extended backups with AdventureWorks2016.bak and AdventureWorksDW2016.bak, which restore successfully; done means identifying the cause and documenting a confirmed restoration fix or backup issue.