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How to update from 6.1.1 to 6.4 (css)

If i download the new css files for F6.4 and just replace my F6.1.1, everything becomes a mess.
i want to make this update because in F6.1.1 i have a problem with the vertical menu, the sub menu is not in the right position as you can see in this image:
Wrong submenu position F6.1.1

site css

If i download the new css files for F6.4 and just replace my F6.1.1, everything becomes a mess.
i want to make this update because in F6.1.1 i have a problem with the vertical menu, the sub menu is not in the right position as you can see in this image:
Wrong submenu position F6.1.1