yes the sbc clients uninstalls the old client before installing itself.
i installed the 4.8 client in a not-standard directory when deployed maybe thats why i found this below out:
keep note that this way the old directories are not deleted
so in the program files directory there will be 2 directories one for the new client and one for the old
in the start menu of windows both the client parent menu option are available
i delete all that manually so far, but ill be making a GPO for it soon when i get more time