Hello!
You need Microsoft Visual C++ 2008 and higher and Microsoft .NET Framework 4.7.2 to be installed.
You should check that you are trying to start version downloaded from:
Lunacy 3.15 (alpha version): Lunacy 3.15.0.1 - Ready To Use <<< The First Alpha Build Is Here!
Lunacy 3.14: https://icons8.com/lunacy