Would suggest you to check with the manufacturer if this version of Canon Studio Pro is compatible with Lightroom CC2015.
If it is compatible, you should be able to install it and be able to access it through Lightroom under File menu > Plug-in Manager.
You should consult the plugin manufacturer for this error.
They would be the right contact for this.
I suggest that you uninstall and reinstall the plug-in. I am using Windows 10, Lightroom CC 2015.3, and I have access to the Canon Print Studio Pro plug-in through Lightroom. However, the EXE file is located in C:\program files\Canon\Print Studio Pro. It seems that Lightroom is looking in an additional folder on your computer.