Version 2.32 is the latest version.
As NJDude already said, the RandomAccessFiles library is part of the 'standard' libraries and shiped with each new version if B4A.
This means, that, when you unpdate B4A, you get the latest vesion of RandomAccessFiles.
To use it, you still need to check it in the Lib Tab in the IDE!
Make sur that you don't have in the AdditionalLibaries folder.
If my memory serves me correctly, the internal library gets priority over the external library with the same name. Leaving the external library in the additional library folder does not harm anything, but as part of the clean-up there should only be one place for any given library.