I am trying to updated JCE editor pro to 2.8.1 and get the following error - Joomla\Filesystem\File::delete: Failed deleting inaccessible file controller.php

We are using PHP7.2 and Joomla 3.9.13 It runs through the update but stops at 100% and gives the error.

JCE Editor Pro is currently at version - 2.6.27