The requirements state that .NET 4.0 is required. And while i'm sure it is, you may want to update the Requirements page to say that you also still need to have ".NET 3.5 Features" installed because every time I've tried to install VisualCron on a brand new system with only the .NET 4.0/4.5 on it, it prompts me to install .NET 3.5 Features from the Role/Features list. This happened in 2012 R2 and Windows 10 Pro x64.
Brian