Tally.Developer 9 is enhanced to run as a 64-bit native application. Now, it automatically installs 32-bit or 64-bit Tally.Developer 9 application, depending on your system bitness.
On a 64-bit system, Tally.Developer 9 64-bit application supports the SDK of Tally.ERP 9 Release 5.5.3 and later.
For more information, click here .