K2sitepath var has been removed from admin/item edit view

K2_v2.6.8.zip\administrator\components\com_k2\views\item\view.html.php

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but it is required in order to get the list of existing tags

K2_v2.6.8.zip\media\k2\assets\js \k2.js
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start typing in item edit view for an existing tag and you will see

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Hi. This has already been fixed in the development version. The path is build from the URL github.com/joomlaworks/k2/blob/master/media/k2/assets/js/k2.js .