Can not reinstall

System.IO.FileNotFoundException: Could not find file ‘C:_SYSTEM\eM-Client\backup_202007090826.zip’.
File name: ‘C:_SYSTEM\eM-Client\backup_202007090826.zip’
at System.IO.FileInfo.get_Length()
at MailClient.DbBackup.FormBackup.Restore(String backupFile, CancellationToken cancellationToken)
at MailClient.DbBackup.FormBackup.Restore(CancellationToken cancellationToken)
at MailClient.DbBackup.FormBackup.<>c__DisplayClass28_0.<MainForm_Load>b__0(Object a, DoWorkEventArgs b)
at System.ComponentModel.BackgroundWorker.OnDoWork(DoWorkEventArgs e)
at System.ComponentModel.BackgroundWorker.WorkerThreadStart(Object argument)