I am running Win 10 x64 build 1809 and installed Brave Beta (base was 55.11, since updated to 55.12) and noticed that it installed to my C:\Program Files (x86) folder. This folder is for legacy 32-bit applications on a 64-bit OS. Since I’m supposedly running a 64-bit version of Brave, it should default to be installed to C:\Program Files (for native 64-bit apps in 64-bit versions of Windows).