unable to uninstall then reinstall riot vanguard

so i tried uninstalling riot vanguard and it worked, its gone, but when i go into valorant to try to get it to reinstall (i was told it should automatically reinstall) it doesn’t. i was trying to uninstall and reinstall valorant because i’ve been having MAJOR loading time issues mut its not my internet and not my pc. valorant is the only game i cant run.. please help me