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"Use Edit Log for transactions/masters, and digital signature for invoices/reports with Release 2.1. Download NOW!"
https://help.tallysolutions.com/docs/td9rel54/faq/7519.html

Unable to Surrender Tally.Developer 9 License or De-compile the TCP files from the web control centre

You might have tried to perform these operations using the web browsers other than Internet Explorer. At present, Surrender/TCP De-compilation is supported only in Internet Explorer Browser. Hence, please ensure that you are using Internet Explorer to perform these operations.

In case the difficulty still persists, please write to support.tallydeveloper@tallysolutions.com