No Prior Installation Of Rome: Total War How Do I Install Patches For Games??...rome Total War...?

How do i install patches for games??...rome total war...? - no prior installation of rome: total war

I downloaded patches 1.3 and 1.5, but I can not install .... An error indicating that the installation was not detected before the total war Rome.
I did not copy the file onto the pavement in the game install folder, but the error still appears ..... this is the first time that I have to install a patch ... So I have no idea what they want. ... Brothers to help me !!!......