Les videos ont été supprimées (j'avais pas mis le lien du coup )
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Ah merde je suis con.

En continuant les recherches j'ai trouvé ce tool :
https://github.com/Multibit-Legacy/read-multibit-wallet-file

A simple command line tool that exports the private Keys from a Multibit wallet file. The reason this tool exists is because Multibit is out of date and has known bugs. Exporting the private keys or wallet words from Multibit and importing them into another wallet may be the only effective way to access your funds.

Je n'ai pas testé mais ça vaut le coup de check.