Well this is given you pressed the "RUN UPDATER" button already...there is a clear message that says once you update, you can't go back...So if you haven't already clicked that, then you can simply copy the 1.6.6 files back otherwise you need to restore.
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splashingpixels.com on "[Plugin: WooCommerce - excelling eCommerce] Warning: call_user_func_array()"
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