If you don't want to download everything again, don't blame you, just install the DCS World openbeta with no modules.
Then copy your regular DCS World folder files over to it.
Then follow the guide here, http://forums.eagle.ru/showthread.php?t=114030, to covert that install to the openbeta. It's the the last section of the first post in that thread.
You can also just convert your current install over to the openbeta if space is a concern.