See explanation below.
Click General ledger > Reports > Transactions > Trial Balance
Enter the Start and End dates for the report.
Click Destinations ... to specify how you want to 'print' the report.
Select File as the destination.
Select the Downloads\Trial folder for the location.
Select Microsoft Excel for the file format.
Click OK to close the 'Print destination settings' form.
Click OK to 'print' (save) the report to the selected destination.