XF 1.5 Deleted Important File.. How do I regenerate?

I deleted a really important file (thinking it would simply regenerate), and now my forums page isn't loading, giving the error "Fatal error: Class 'XenForo_Template_Helper_Core' not found in /home2/mineroyale/public_html/forum/library/XenForo/Dependencies/Public.php on line 91"

How am I able to regenerate or get a new file? :p
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