Re Download FiveReborn.exe After Installing FiveReborn.
Drag FiveReborn.exe Into The Folder, Replacing The Old One.
Open Up, And You Should Be Good.
PLEASE NOTE: This will not fix the Russian language, this will let you start up your game.
UPDATE: This has been confirmed to work for almost everyone, please note you will need to remove mods.asi from your FR plugins folder if you have one. This should be fixed shortly and your mods will once again work.