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https://help.tallysolutions.com/docs/te9rel66/faqs/8848.html

How to resolve the error Connectivity Error! – could not download required files (Description Report – ‘Balance Sheet’ File:00180-xxxxx.cap).

Cause

This error appears when Capsule file for any report got deleted from Capsule folder/ user was not applicable for it at the time of update and Internet connectivity is unavailable.

Solution

Connect to internet or re-install Tally.ERP 9.