Why does Mathematica show version 11.0.0 after updating to 11.0.1?

I originally installed Mathematica 11.0.0, but I downloaded Mathematica 11.0.1 and successfully ran the installation script. Why does Mathematica stll show version 11.0.0? Do I have two versions installed, and if so, how to I delete the old version and start the updated version?

What operating system?

I’m running Mathematica 11 Home Edition on 64-bit Ubuntu 16.04 LTS on an Intel i5 processor. I’m pretty sure I’m still running the old version as it remembered all of my recent files and didn’t ask for the license key the first time I launched Mathematica after running the script to install the updated version. Help->About Mathematica still indicates the following.

Version Number: 11.0.0.0

Platform: Linux x86 (64-bit)