Just tried installing the newest version. It just says installation failed and click "Finish" for troubleshooting. I've enabled everything in System Preferences -> Security and I'm using Safari v10.0.3 on Mac OS 10.0.5
I'm assuming you mean OS X 10.10.5, not 10.0.5, yes?
What is the name of the installer log file you are using?
In order to troubleshoot the error, I'll need to get the installation log files from you. Please do the following:
Retrieving data ...