Siemens SIMATIC HMI Series System Manual page 146

Migration
5.6 How to migrate S7 projects
Using WinCC Migrator to migrate all integrated WinCC projects
You may also use WinCC Migrator to migrate all integrated WinCC projects. The procedure
corresponds with the description in "How to migrate WinCC data".
You are prompted to start migration if you now open an S7 project. Click "Yes" to open WinCC
Migrator. You are informed of the updated state of the project as soon as you click "Migrate".
Note
You must migrate all components of an S7 project
You must first migrate all components of an S7 project before you can work on this project.
Operation of a partially migrated project my result in inconsistencies.
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WinCC: General information and installation
System Manual, 02/2017, A5E40840020-AA