.NET Framework 3.5

How can I install .NET Framework 3.5 when League of Legends shows error 0x80070057?

I bought a new laptop and installed the Riot launcher, but League of Legends says .NET Framework 3.5—including .NET 2.0 and 3.0—is required. The built-in installer fails every…

How can I install .NET Framework 3.5 so League of Legends will run?

I got a new laptop and installed the Riot launcher, but League of Legends says .NET Framework 3.5, including versions 2.0 and 3.0, is required. When I let…