If you want to print old GST Invoice bills using SalesMate Plus, then go to File -> POS ->Print POS Receipts -> Select the appropriate Receipt Type -> You can find the bill by two methods 1st one is enter the Bill Number and select the bill or click on the Specified Period and enter the specific date range after that find the bill from the list -> Select the bill -> OK
Now the bill will be displayed on the screen. For printing the bill go to File -> Print