You can download the required installation files for T4EA from the Siemens download portal.
Steps
Go to https://download.industrysoftware.automation.siemens.com
Log in with your webkey. (If you do not have a webkey, follow the instructions from Siemens).
Go to Teamcenter and Teamcenter Rapid Start > Full products > Integrations and Solutions > EnterpriseApplications > 12.
Continue to 12 > 18.2 > Click Teamcenter_Gateway_for_EA18.2_for_Tc12_WIN64.zip
Click Save (In this example the file is saved in C:\Temp, if possible, download directly on the application server of Siemens Teamcenter. Otherwise move the files after downloading to the application server.).