Migration Guide : 4. Upgrading from OpenROAD 4.0 or 4.1 : Phase 1: Prepare for the Upgrade : Make a 4.1 Development Environment Available
 
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Make a 4.1 Development Environment Available
The upgrade process will highlight certain issues with your 4.1 applications. You need a working 4.1 development environment to investigate and document these issues.
The development environment must include access to the following:
A database with a full copy of the source for all the existing OpenROAD applications
Suitable data for developers to exercise every significant business and maintenance path the application supports