When I tried to install Autohotkey 1.1.20.1 recently on a Windows 8.1 64bit machine, the installer failed. It 'ran' ok, but on the installer splash screen, none of the buttons or links would 'do' anything. I tried the "Express Installation" and "Custom Installation" buttons and the "Read license" and "Extract to..." links. I tried running the installer as an Administrator. None of that worked; apparently other people have had the same problem. In the end, I found this link, which suggested installing the application from the command line. It worked, and took about 3 seconds to complete. The command I ran (from the directory where I downloaded the Autohotkey installer): "AutoHotKey112001_Install.exe /S"