Adding Katy Perry and Showtime

i have sims 3 pets, ambitions, generations and late night and theyve all been working and everything is up to date but i want to add katy perry and showtime
i used to know what i had to do to add the games but i forgot
do i need to uninstall everything and then reinstall it all (including katy perry and showtime) and add the patch and the fix and everything all over again?? or do i just install the two games and add the fix to those games only to play?