When server change downloading the 4gb package problem

There is a bug, I am playing on EUW and TR. let's say when I switch to TR, client downloads the files for TR 4 GB. then I switch back to EUW, client redownloads files for EUW 4Gb again. then I switch to TR client redownloads files for TR and so on. Everytime I switch he has to download files and wait for it to finish before he can log in and play. This have been happening to me like last 3 week. Riot please fix it
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