That was what I suspected and tried but it bricked my systemOn telegram group people said that you can dirty flash with adb sideload. For me encryption is a must, so have to wait for twrp

Battery Life is f*cking insane for me with the latest 19.1 build from arian. LOS 17.1 pumped the battery dry after two days with a worn out battery capacity of 3000mah and without much display on time (maybe ~1-1,5h per day).
LOS 19.1 will last 6 days on standby with airplane mode during the night. Something may have been wrong with my LOS 17.1 setup but there was no clear indicator of an app going haywire in the battery drain statistics even when monitored with advanced tools.