Please how do you install the beta version of openhab 2 on rapsberry pi.
Did you see this? https://github.com/openhab/openhab-distro/blob/master/docs/sources/getting-started.md
All in all it’s straight forward, download the .zip file to the Pi, extract it to a folder (wherever you want it) and start it with ./start.sh from openhab-root.
If you want to autostart, build a openhab.service file for systemd (just like the one for OH1) and place it in /etc/systemd/system, enable it with systemctl enable openhab.service
If you already have configfiles from OH1, just put it in the corresponding folders from OH2. Remember that OH2 can download the addons itself and that the openhab.cfg is split in individual files.