So what's in here related to GST update for india. 

IN_GST_Foreign Exchange fluctuations between Invoice and payment while payment of services for importing vendor.

IN_GST_GST on interest amount posted through finance charge Memo

IN_GST_Enter E-way Bill Nos. in posted purchase invoices

How to obtain the Microsoft Dynamics NAV update files

This update is available for manual download and installation from the Microsoft Download Center.Download Cumulative update CU 34 for Microsoft Dynamics NAV 2016

As every CU has two updates, 

1. Platform fixes.

a.The Import-NavData cmdlet generates a huge database when you use SQL Server 2016 compared to an earlier version of SQL Server.

b.Field lookup issue in the Phone client. 

c. Performance issue when you run the Calc. Plan report on the Req. Worksheet page.

2. Application fixes (globally & local). 

a. When you change the work center on the Prod. Order Routing Line page, allocated capacity and other relevant fields are not updated accordingly for the parallel routing. 

There are other related to finance, report and filter.