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The program displays "cannot create scratch" message when started.
On Windows: check if there is enough free space (2-3 GB) on the scratch drive, specified in Settings->General->Scratch drive. Also, try changing the scratch drive setting.
On Mac: check if the scratch folder, specified in Settings->General->Scratch folder exists, is available for writing, and there is enough free space (2-3 GB) on the drive where this folder is located.
et :
All these problems appear sometimes when the installation package has been downloaded incompletely. You should download it again.
Bon courage à toi. L'informatique c'est bien quand ça marche ;-)