Windows: disable "runas" code path in updater
On Windows, for safety's sake, we should disable the "runas" code path that is used when the user does not have write access to the directory where the browser is installed. Because we require write access to the profile, we don't expect that this change will inconvenience many (if any) users.
To upload designs, you'll need to enable LFS and have an admin enable hashed storage. More information