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Error 404 when installing plugin

It was issue from mode_security by server. Please try another method 

1) Go To Plugins 

2) Click "Install the Plugins" menu 

3) Install every plugin one by one 

4) Activate it. 

Another Method is:

1) Go To Plugins 

2) Add New

3) Click upload plugin

4) Select the plugin file from plugins folder which you extracted the complete theme folder.

5) Install every plugin one by one 

6) Activate it. 

Try above methods.