Wacom add-ons are not available in Internet Explorer for all users
This can happen if the SDK components were installed by means of a CAB file.
There are 2 CAB files for installing STU components:
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wgssColorSTU.cab (originally called wgssSTU520.cab) - this includes the STU driver installer and requires admin privileges. It enables the STU components for all users on the PC.
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wgssSTU.cab - enables the STU components for the current user only, without the STU driver. It does not require admin privileges).