orangeLearner
I'm sorry to hear you had such a hard time to install the plugin. Not sure what has cost you so much effort as most people succeed in installing the plugin in less than half an hour. Mac 64 bit with Juno is the most challenging environment though.
About the 2 remaining issues.
The error during build.
As you are running eclipse Juno you should upgrade to the latest version of the plugin. That should fix the issue. Note that you will need to create new projects as the existing ones contain "a bug" which is not cleaned.
To clear "the bug" manually see the comment of bgolenko at Odd Build Error When Using Eclipse Juno · Issue #12 · Sloeber/arduino-eclipse-plugin · GitHub
The upload problem.
This is a pure mac related problem where Peter send me a good solution.
I've added the solution to my FAQ which you can find at This page has been moved
Best regards
Jantje