Please download attached PDF file and follow steps after installation of new version 16,2.

After downloading the patch, run Update GST Tax Master from System-GST Updates menu to update tax codes. You can update product HSN and product rates using these options. Please make sure that you understand these options before running them. Else you must rectify your product rates manually. Applying any formula will not rectify product rates accurately. 

You may get online help by submitting a ticket here!