If you want to use another biblatex/biber version than the official (older or newer) you can do it like this:
biblatex.tds.tgz from here: https://sourceforge.net/projects/biblatex/files/?source=navbar.
tgz somewhere outside miktex and attach the root folder as a new root in miktex settings. This will make it easy to remove it later: you can simply detach the root.
You can put the accompanying
biber.exe whereever you want in your path. You can replace the original biber (but it is possible that miktex realizes the change and tries to "repair" biber at the next update). Or you can use some other folder: if windows searches for biber there first you can simply use
biber as command in your editor, in other cases you will have to add the full path. You can also rename
biber.exe to e.g.
biberold.exe and change the settings in your editor to use
biberold.exe – I e.g. have also a
biberdev.exe to test the development version.