The official Italian translation is now a mod for the daily version of ResidualVM (right now it's the only version that support the longest journey).
You just need to decompress the archive in the mods folder.

You can download the mod here :

http://www.oldgamesitalia.net/traduzioni/longest-journey

Fantastico. Grazie!

Hello,
I'm searching for interface and subtitles in italian, not the video or audio, do you know where I could find this?

hi, there is no video or audio for the italian release of the longest journey (only the intro is in italian) so you can just download that patch.

PS. Right now the mod is not 100% complete, is missing the main menu audio file (I made a little mistake the first time I copied the files), it will be updated in a few days on the site but you can go on the forum of OGI where I posted a temporaly link to the updated mod/patch ita.

I found it thank you!

Now it's updated on the website.