This plugin has several bugs that prevent it from working.
In the file: front/class-wc_update-variation_in-cart_ck.php
1. The bug: makes direct calls to WooCommerce class
wc_get_product()) for product id, but that is no longer a valid way to obtain product id as of WooCommerce version 3.
The fix: search for all references to
$product_woo_ck->idand replace with
$product_woo_ck->get_id()(lines 215, 364, 368)
2. The bug: references a non-existent variable,
$attribute_keyson line 254.
The fix: Rename variable to
The two fixes above at least allow the variations dropdown to actually appear.
There are still more bugs in the submission part once you change the variation, and I gave up trying to fix it.
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