1. Install lftp package 

yum install lftp

2. Copy files (ftp_password.enc, sync_scripts.sh, .keyfile) to /abs/zabbix/externaltools/zbxdb/bin

3. Edit cronjob if necessary and test

#Sync latest database zbxdb checks
0 1 * * *   /abs/zabbix/externaltools/zbxdb/bin/sync_scripts.sh > /abs/zabbix/externaltools/zbxdb/bin/sync_scripts.log 2>&1