It can be found here http://www.microsoft.com/en-us/download/details.aspx?id=36820
How To for a Standard Edition
Download the update installer :
Click on Install Updates
After it is Finished you have to reboot the server.
After the reboot don’t forget to update the database
Install-CsDatabase -ConfiguredDatabases -SqlServerFqdn SE.FQDN -Verbose
When this is done we can proceed to the CU1 update for the Edge server.
Press Install Updates.
after its finished check if all the services are started and check the topology in the control panel if everything is OK