MANUAL INSTALLATION: 

01 - Delete any previous versions (Spider*.gha) in your Grasshopper Components Folder:
     From Grasshopper: File -> Special Folders -> Components Folder 
     (or) From Windows Explorer: C:\Users\*your name*\AppData\Roaming\Grasshopper\Libraries

02 - Find 'Spider_V1-2-0.gha' in the ZIP file. Windows is sometimes blocking files downloaded from the internet. 
     Right click on the file, go to the 'Properties' and if you have 'Unblock' option click on the checkbox and then 'Apply'.

02 - Copy 'Spider_V1-1-0.gha' file to your Grasshopper Components Folder:
     From Grasshopper: File -> Special Folders -> Components Folder 
     (or) From Windows Explorer: C:\Users\*your name*\AppData\Roaming\Grasshopper\Libraries

03 - Restart Rhino and Grasshopper (close and open again).

04 - You should be able to see 'SpiderGH' as a new tab within Grasshopper.

05 - Enjoy!

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This plugin was inspired by the tutorial from Jose Luis Garcia del Castillo: https://www.youtube.com/watch?v=LnkaeFm6VkM
For any information, problems or requests, feel free to contact me: arch.graovac@gmail.com