Alcatraz in Xcode 7.1

Question

Note that from Xcode 8 Alcatraz no longer works Editor Extension Tutorial

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I am unable to install Alcatraz for Xcode 7.1

According to

Answer 1

I moved Alcatraz.xcplugin outside from the plug-in folder. Opened Xcode, then quit. Later I moved back into the plug-in folder and reopened Xcode. It asked me whether to load bundles, just hit load and it loaded. [github.com/supermarin/Alcatraz/issues/359]