What operations are required Prior to an Update of Unity Pro with Control Expert?

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Before updating Unity Pro with Control Expert, it is recommended that the current project files be saved.
If the previous installed version is earlier than Unity Pro 4.0, the following items must also be saved:

Custom libraries
Private ASI catalog

1. Export Current Project Files

This step consists of generating files that are used to migrate projects to Control Expert. Export current projects from the project file format (*.STU) into an archive application file format (*.STA). It is also recommended to export into an application exchange file format (*.XEF).
The file types are:

*.STU files from previous versions of Unity Pro are not readable on the new version of Control Expert.
*.STA files are archive files compatible between different versions of Control Expert and Unity Pro. However, these files can only be created for projects that can be successfully built. The advantage of this format is the capability to connect to the PLC after opening the project on a newer version of Control Expert.
*.XEF files are used for exporting a global project without global DTMs configuration and are compatible with all versions of Control Expert or Unity Pro. Importing an *.XEF file requires a Rebuild All of the project.
*.ZEF files are used for exporting projects with global DTMs configuration and are compatible with all versions of Control Expert or Unity Pro. Importing an *.ZEF file requires a Rebuild All of the project
Save custom libraries.

For additional information about project compatibilities with Unity Pro versions and PLC firmware, refer to Unity Pro/Control Expert release notes.

For more refer the attachment.