How to centrally deploy sp 13 patch

Dear all,

When i tried to apply MDK 2.5 sp 13(patch 09) to all the clients from the server,the files are not getting updated. (I followed the help from help.sap.com)

That patch downloaded as an add-ons in the in the installation folder as such.(that contain the updated MEg.jar and other files). But i found that my existing MEg.jar(lib dir) file is not updated with the newer one.

What should i do ?.

Is it necessary to update it manually after application(patch) installation ?.

How can i make that modification automatically ?.or will it happens automatically after successful deployement ?

please help me to resolve this problem and i promise to return and reward the answers.

Thanks & Regards,

Kishor G