I have extension version 2.8, which i disabled. Then emptied the phpBB cache. Deleted old folder via ftp, uploaded version 3.4 and enabled it from the ACP, which gave me an error of "Module already existing: OA_SOCIAL_LOGIN_ACP".
I reuploaded the 2.8 version and reverted to using it without problems.
How to proceed for successfull version update to 3.4?