I really like the launcher. I get a big res "install" button then it turn into a "launch" button.
The install part will make a folder for the game and fetch downloadable file for me. Launch start the installer for your RPG maker games. After that, there is an option a bit hidden to open the folder and the game.exe file is there in a new foldee creared by the installer.
For abyssal agent, I deleted the installer and moved all the files from the folder created by the installer to where the installer was and now the launch button launch the game :)