import database after update

Hi,
I'm a lil bit new about projeqtor.
I'm trying to update my projeqtor from v7.. to the latest version v9.3.4
That's working but, I don't have files and all my job 
I search a lil bit here and i saw and understand that's should be automatic
I tried some things like copy the previous "files" folder and, after write above the previous "projeqtor" folders, put the "files" folder in the new projeqtor folder but nothing
Sorry for my broken english.
and thanks for all help who will come
PS: I will be able to respond tommorow 9AM CEST