I dont really know. I think you should uninstall a6 before you try to install the a7, there is a possibility that it could cause conflicts otherwise.
My suggestion for you would be to make a backup of all your gamestudio folders and then uninstall/reinstall.
Quote: i just want to know whats better and new in the a7. and if i can install the a7 beside the a6.
the physics is whats better in a7, plus the rendering, the icons, the new WED, there are a list of new features somewhere you can read, but for me it is pretty much the ability to use physics.
For installing the a6 "beside" a7 is probably not a good idea. But hopefully someone more knowledgeable than me will answer. I personally would not take such a chance.