I have two versions of FF, one 3.5.11 and a beta 4.0.x. When the 3.5.x upgraded, it overwrote the beta. Downloaded 4.6 and tried installing. Still 3.5.11 What to do?

Even though they are in different directories, the 3.5.11 update overwrote the beta version as well. I tried downloading and installing the latest beta version 4.0 beta6 and tried installing it. This did not work as I still get 3.5.11 no matter which version I open.

# Make sure the installation directories for the beta and the stable versions are different.
# [[Managing profiles|Make]] a new profile.
# Quit Firefox.
# Launch the executable file in the beta installation directory.

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