We hope you are doing well.
Please use the below given steps to install mysql on MAC
Download the .dmg file of mysql for mac with the help of below given link.
Open the link select the option for MAC after that download the file with the name Mac OS X 10.10 (x86, 64-bit), DMG Archive
To check the full steps for installation please follow the below given link.
Unfortunately we don't have any steps to install pentaho on MAC but for the reference I am sending you below links.
Pentaho Data Integration - http://wiki.pentaho.com/display/EAI/01.+Installing+Kettle
Pentaho Report Designer - http://wiki.pentaho.com/display/Reporting/Installing+and+configuring+PRD
I hope it helps.