Check your %localappdata%\Plutonium\storage\t5\zone directory. You can open it by pressing Win+R and pasting the path into the window that opens. You should only have 11 files there, which are:
frontend_patch.ff
plutonium_ui.ff
plutonium_ui_mp.ff
and 8 files in the structure **_plutonium_ui.ff such as en_plutonium_ui.ff
If you have other files there, remove them.
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