On Feb 29, 2012, several customers were unable to use their Tally for a full day. To ensure that your license remains safe from attacks, we strongly recommend you to move to the latest version of the product – Tally.ERP 9 Release 5; the most powerful and comprehensive compliance solution! Click here to upgrade your license online. Choose 'Tally Software Services' (silver/gold/international based on your license) and then enter the license number, make the payment and download the latest version of Tally!