mysql problems installing ServiceDesk Plus on CentOS7

mysql problems installing ServiceDesk Plus on CentOS7

I have tried installing on CentOS7 64-bit with and without mysql installed, I cannot get servicedesk started.

1. Instructions indicate mysql is installed with ManageEngine_ ServiceDesk_Plus_64bit.bin but
  there is no mysql folder as indicated on the install guide.
2. if I install mysql first, I get the following error when starting Servicedesk as mysql is not in the ServiceDesk folder. 

Cannot run program "/root/ManageEngine/ServiceDesk/mysql//bin/mysqladmin": java.io.IOException: error=2, No such file or directory

Any help appreciated.

Thanks Michael.

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