Relocate all files

Recently i've moved to a new computer. Before it i used the Library > Backup library and on the new computer, used Library > Restore library.

It worked but turns out that the folder with my music files on the new computer, has a different name, so every track i need to load returns an error (File could not be found).

I know i can right click on the file and then use the Auto relocate option : it works ! 

But i don't know how to do this for all my files without clicking one by one, right click and Auto relocate.

How can i do an auto relocate for the entire library ?

Thanks !