IceDragon Version number

The Ice download page says “Version 52.0.0.4 for Windows”
The Ice installer says “version 40.1.1.18”
The Ice installed version has “File version 52.0.2.6324”
The Ice installed version has “Product version 52.0.0.2”

What did I just install?
Is that the latest version?

Thanks in advance.
(I am running Windows 7 Home Premium with Service Pack 1.)