System and method for installation of an open-sleeve add-on device on a wind turbine blade

A method for installing an add-on device onto a blade of a wind turbine includes configuring a plurality of tag lines to a wrap, the tag lines having a length to extend to a ground location when the add-on device is positioned on the blade. With the rotor, positioning the blade to a first rotated position. The add-on device is located at a desired span-wise location on the blade such that the wrap forms an open-sleeve configuration draped around the leading edge of the blade and span-wise sides of the wrap extend along pressure and suction sides of the blade adjacent a trailing edge of the blade. With the tag lines, the wrap is tensioned against the blade. Attachment devices configured with the wrap are affixed to the trailing edge of the blade.