The Android Studio version I have installed is a bit old now so it cannot automatically update. I have to manually download the full version and update. So I did download it from here.
My question is do I have to uninstall the old version first in order to install the new version? And also I don't see a setup.exe or anything in the latest version I downloaded. How do I update this properly?
I found that I did have to uninstall the previous version and re-install.
There were some other problems I had as well regarding android support libraries, SDK locations for imported eclipse projects.
In case it helps you can find my solution to another question regarding project issues at https://stackoverflow.com/a/24440211/499448