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1.6rc tries to change table character set to uft8mb4. The statement gives an error with mysql database.
USER ERROR: mysqli Error: ( ALTER TABLE .administrators CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci ) failed. mysqli returned the error You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '.administrators CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_520_ci' at line 1 in /var/www/html/ZenPhoto/zp-core/classes/class-dbmysqli.php on line 80
trigger_error called from dbMySQLi->query (class-dbmysqli.php )
from dbBase->convertTableToUtf8mb4 (class-dbbase.php )
from index.php 
The database name needs to be quoted.
.administrators CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4
Updating the character set and collation for the tables using mysql-client allowed setup to skip this step and complete