There is no official free "RSLogix Project Migrator" tool from Rockwell Automation. Migration typically requires:
6. Migration Report & Validation
C:\Program Files (x86)\Rockwell Software\Studio 5000\Tools\RSLogix Project Migrator (or listed as Translate PLC-5 SLC 2.0 Tool For RSLogix 5000 (v19 and v20):
To download the RSLogix Project Migrator tool for free, follow these steps:
Database Exports: To include symbols and comments, you should export an accompanying .TXT or .CSV database file from the original RSLogix 5/500 software before starting the migration.