using old version of beammp and server

hi id like to use a old version of beammp and its server so i can play beamng with my sister, as her PC runs windows 8.1 (and cant upgrade to 10 due to personal prefrences) and i just want to play the game with her, we both have beamng 0.34.2 so it will work if we can get a old beammp version working

Why are you unable to update your BeamNG?

because version 0.35 doesn’t support 8.1 and doesn’t run when updated

Sorry, but if you are going to remain with Windows 8.1 just due to personal preferences programs and services are going to start falling out of your range of compatibility. As BeamNG updates we also update and these updates include security fixes, enhancements and back end infrastructure updates which mean that even older versions of our own launcher may not be able to connect to our infrastructure. As an operating system 8.1 is over a decade old. You will not be able to connect to BeamMP.