Moving a League of Legends installation
Over the weekend I replaced a few parts in my desktop. Since one of the parts I replaced was the motherboard, I also reinstalled Windows to avoid any driver issues. Every other time that I've reinstalled Windows, I've also downloaded and re-installed the League of Legends client, reasoning that it didn't work after the reinstall because the client hadn't been installed correctly.
Turns out that I was wrong and the smart people at Riot don't use registry entries or anything like that. As long as you have Adobe Air and DirectX 9 installed, you can simply run
lol.launcher.exe in the root LoL directory and everything should work as it did before.