Visit this website:
And click on the 'Download SigPlus' image or directly download the software from this link:
Run the software after installing it.
Note: Depending on your security settings, you may need to login to Windows as an "Administrator" to begin the installation, or right-click on the SigPlus application and select "Run as administrator".
Next follow the prompts of the installer software. You will be prompted to specify which Signature Reader you own, so be sure you know the model and connection type before you begin.
If needed after installation, SigPlus will be found in your C:\Windows\SigPlus folder.