About PBE . Do i need to redownload the game !?

Hello all, i need some help ! i created a pbe account and downloaded the **PBE **client , after launching it it starts downloading the game, it's a 17 Gb ! _am i obliged to redownload it or what !?_ so confused :( thanks a lot for answers <3 LOL ==> C:\Riot Games\League of Legends PBE ==> C:\Riot Games\PBE
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