The following items must be addressed to make your Conga Composer solutions Lightning Ready. Use the navigation in this window to walk through the steps.

ItemWhat to Do
Configure Conga Composer as a Connected AppsConfigure the Conga Composer Connected App
Non-OAuth Conga buttonsConvert non-OAuth buttons to OAuth
Reports used to gather data for Conga templates

Convert reports to queries.

Converting reports to queries is highly suggested but is not required.
TemplatesConverting reports to queries results in new field naming convention; all templates should be reviewed
Home Page Composer linksMove to Global Merge record or use the Utility Builder to design a new layout.
JavaScript Buttons (such as Composer or Conga Batch List View Buttons)Choose a different implementation technique or engage Conga Services to build a custom solution.
Composer User Permission SetAssign the Composer User Permission Set to Conga Composer users.
Winter '20 Critical Update related permissionsAssign the necessary permissions or permission set related to the Salesforce Winter '20 Critical Update. This is required for orgs that have Composer versions preceding Composer 8.179.
As each Composer implementation is unique, additional steps might be required to make your specific Composer solution Lightning ready.