I have personally suggested that I can build this functionality into the B4a Object Browser, however this will not happen just now.
The rationale for this is simple:
If you own say B4a version 2.00, and you do not have any time left in your support, if there was a way to auto update, then you could get version 2.70 of B4a without paying for it.
:sign0161:
To make matters worse, registered user details aren't held anywhere to check against, so how would an update function be able to check that you are or are not allowed to update?
Until support is built in to overcome the aforementioned problems, this won't happen.