Keep getting invalid package error when downloading app from Play store

Question

I can't download any app from Google Play, I get invalid package message. I know this is an old problem and I that I have to clear Dalvik cache. Problem is that I can't down load the file manager to do this.

Answer 1

Problem is that I can't down load the file manager to do this.

You can download a file manager from the browser and install it. OI File manager avaible from the web page as are many others if you search around.