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The Nagios XI install wants a clean install of Centos or RHEL and an empty MYSQL database to install and I am guessing that the old MYSQL database was left on the server causing the error.
Try dropping all of the MYSQL databases and try the fullinstall again.
If it fails, please post the install.log file so we can see the full output.
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The free version only allows you to monitor 7 hosts MAX.
After the 60 day trial period, the system will switch over to the free version and only allow 7 hosts to be monitored.
Be sure to check out our Knowledgebase for helpful articles and solutions!