I tried all that you mentioned and got the following error
Error while trying to create admin user: An exception occurred while executing 'CREATE TABLE `oc_appconfig` (`appid` VARCHAR(32) DEFAULT '' NOT NULL, `configkey` VARCHAR(64) DEFAULT '' NOT NULL, `configvalue` LONGTEXT DEFAULT NULL, INDEX appconfig_config_key_index (`configkey`), INDEX appconfig_appid_key (`appid`), PRIMARY KEY(`appid`, `configkey`)) DEFAULT CHARACTER SET utf8 COLLATE utf8_bin ENGINE = InnoDB': SQLSTATE[42S01]: Base table or view already exists: 1050 Table 'oc_appconfig' already exists
Admittedly this is my first time using anything like this so i'm sure its probably just something simple I have done myself.