Assuming you do not have a corporate support contract but need to migrate one or two projects, follow this path:
The is a free utility developed by Rockwell Automation to automate the conversion of legacy PLC-5 and SLC 500/MicroLogix projects (originally programmed in RSLogix 5 or 500) into tag-based projects for modern Logix controllers (ControlLogix or CompactLogix) using Studio 5000 Logix Designer . How to Download the Tool rslogix project migrator tool download free