Add Content Manager’s Offline Package
To install an offline package from unzipped local folder:
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Install new software from menu Help → Install New Software 
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Click to button. 
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Click to button. 
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Browse for local folder containing the unzipped plugin. 
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Click to button. 
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Uncheck Group Items by category option. 
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Select available plugins and click 
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Click to available plugin and click 
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When Security warning appears, click to 
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Restart IDE. 
To install offline package directly from the zip file:
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Install new software from menu Help → Install New Software 
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Click to button. 
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Click to button. 
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Browse for a downloaded zip file. 
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Click to button. 
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Uncheck Group Items by category option. 
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Select available plugins and click 
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Click to available plugin and click 
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When Security warning appears, click to 
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Restart IDE.