Here is a little tool I made for those who want their compressed archive without having to go through the installer RPG Maker XP/VX makes.
Considering how long time the compression takes there is also some time to save if your project is big size wise. (Why do such a compression when you gain so little? Unencrypted contents you do gain something though)
I can tell you that RPG Maker XP failed to create an installer for a 228 MB big project. So if your project is big enough you may have to use this tool. I have successfully made a 174 MB .rgssad which seemingly ran perfectly fine. It was a crafted example though.
I haven't tested to see whether RPG Maker VX has the same issue or not.
Copy the RPG Maker Encrypter.jar over to your project at the same place as Game.exeP.s. I have been lazy with the GUI, it does disappear while the encryption is taking place.
Run RPG Maker Encrypter.jar.
Note that no dialog is visible while it works.
It will tell you when it finishes.
I have encrypted 174 MB in less than a minute, so it shouldn't take too long. (Only the Data and Graphic folder will be encrypted)