How to Install Arduino for Mac OS X - dummies
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How to Install a Computer Program - dummies
Safely open apps on your Mac - Apple Support
How to Install a Computer Program - dummies
Since the release of OSX 10.7, your Mac is initially set up to only allow Applications found on the App Store to install on your computer as a Security Measure. Otherwise, it will consider the application to come from an Unidentified Developer and block installation. Mac OS X - Install Programs from Unidentified Developers Aug 02, 2012