Take care, AS 4.12.6 requires a complete removal of the AS 4.12.5 version and it re-installs everything into C:\Program Files\BRAutomation4 for some reason (there is no option anymore in the setup to chose another path) which causes a re-compile of all of my projects.
Why got the path changed?
In my opinion the installation path should not get changed within the same minor releases.
Independed from that, C:\Program Files is meant for 64-bit software installations, C:\Program Files (x86) is meant for 32-bit software which AS actually is.
Not sure why it ended up in there in general.