After downloading the YESB from downloads page , Double click the file to run and follow prompts to complete the install 

To install YESB12 or later Microsoft .NET Framework 3.5 will need to be installed.  Microsoft .NET Framework 3.5 can be downloaded from Microsoft's website.

Please install the year-end service bulletin (YESB) through Add/Remove Programs when logged in as the local administrator on the server as the installation instructions outline.  Improper installation of the YESB can result in system errors when producing 1099 and/or W2 forms.

Reboot the server after the YESB has been installed to have the update take effect.