Solved
Download of STM32H7B3I DK failed in TouchGFX version 4.21.1
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Could you try to download that zip folder.
Then copy it inside the C:\Users\USERNAME\AppData\Roaming\TouchGFX-4.21.1\Downloads\STM32H7B3I-DK\3.0.12 folder and replace its extension with ".tpa".
Then open TouchGFXDesigner again and let me know if it works.
/Yoann
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