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?