Hi @Valentin Saunier
Where did you buy this Office?
If you bought it from another source, not Microsoft web site, it's recommended to ask seller for install direction, it may be different from ones of Microsoft website.
For example, the Office bought through Groupon, users have to go and download a specific ISO image from the provider in order to install using the key code they provided.
Any misunderstandings, please let us know.
Thanks for your understanding.
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