On the source ordinateur:
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On WinSCP Login dialog, use Tools > Export/Backup Configuration command.
*(In case you have a very old version of WinSCP, vous allez trouvez le Export bouton on Preferences dialog)*
WinSCP will offer you to store all your configuration to an INI fichier.
On the destination ordinateur:
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On WinSCP Login dialog, use Tools > Import/Restore Configuration command.
And sélectionner the INI fichier exported depuis le source ordinateur.
This all is covered in WinSCP FAQ:
How do I transfer my settings to another computer? How do I import/export my settings?
The FAQ covers even situation, when your source ordinateur n'est pas fonctionnel, but you au moins have an access to its fichiers.