We have noticed a minor problem with the ON1 Plugins being listed twice under the "About Plugins" Window in Adobe Photoshop CC 2015.5. Please refer to the screenshot below:
Our development team is investigating this minor problem. However, you will not need to worry about the plugins being listed here twice and can disregard this entirely. This is not where you will go to launch the plugins from Adobe Photoshop and it will have no effect on your ability to use the plugins from Adobe Photoshop.
To launch the plugins from Adobe Photoshop CC 2015.5 please go to File > Automate.