Need help installing

[MickMack]

Here is the CMD




Your environment has been set up for using Node.js 8.11.3 (x64) and npm.

C:\Users\xxx>cd downloads

C:\Users\xxx\Downloads>cd gekko-develop

C:\Users\xxxx\Downloads\gekko-develop>cd gekko-develop

C:\Users\xxxx\Downloads\gekko-develop\gekko-develop>npm install
npm ERR! code SELF_SIGNED_CERT_IN_CHAIN
npm ERR! errno SELF_SIGNED_CERT_IN_CHAIN
npm ERR! request to https://registry.npmjs.org/abbrev/-/abbrev-1.1.1.tgz failed, reason: self signed certificate in certificate chain

npm ERR! A complete log of this run can be found in:
npm ERR!     C:\Users\xxxx\AppData\Roaming\npm-cache\_logs\2018-07-21T20_54_24_613Z-debug.log

C:\Users\xxxx\Downloads\gekko-develop\gekko-develop>

No UI pops up when I hit enter.
Any help is appreciated
Mick