If you are trying to launch the League of Legends client only to be greeted with installation errors, crashes, or a prompt telling you that .NET Framework 3.5 is missing, you are not alone. This error can stop you from entering the Rift entirely, leaving you staring at a black screen or a looping installer.
DISM /Online /Enable-Feature /FeatureName:NetFx3 /All /LimitAccess /Source:D:\sources\sxs net framework 3.5 league of legends
Do not download .NET 3.5 from random "DLL download" websites. You will get malware. You must use Microsoft's official channels or Windows Features. If you are trying to launch the League
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