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Installing Postbooks 3.4 on to Apple Mac

Post books 3.4 install on to mac book pro 
I have used xtuple post books for 7 years.
I need to install the programme on to my Apple Mac book pro.
I cannot do so as keeps showing : 
Error: Couldn't raise admin pivilages.
I have Mac Sierra version 10.12.1

I have looked on Frequently asked questions sections online and then tried logging in on my mac book as "root user" with admin pivilages but I still keep getting the above error. 
Can you help please?