Error: cannot find module hdwallet-provider - trying to deploy contract to ropsten using infura key [duplicate]

Question

I have reviewed the other posts in the last few days following what seem like forever for get to sync to my local machine - so this is my last try to get it to deploy the petshop contract to ropsten via using a key from infura as suggested by someone as the sync in ropsten is taking too long.

I have reconfigured my truffle.js to use an infura key but when

I run the command to deploy I get the cannot find module truffle-hdwallet-provider - (see screenshot below)

Any other suggestions would be greatly appreciated -

Update:  
npm uninstall ethereumjs-wallet
npm uninstall truffle-hdwallet-provider
npm install --save ethereumjs-[email protected]
npm install --save [email protected]

my truffle script is below - I have grey out the key for obvious reasons :)

var HDWalletProvider = require("truffle-hdwallet-provider");
const MNEMONIC = '*******************************************************';

module.exports = {
  networks: {
    development: {
      host: "127.0.0.1",
      port: 7545,
      network_id: "*"
    },
    ropsten: {
      provider: function() {
        return new HDWalletProvider(MNEMONIC, "https://ropsten.infura.io/v3/*****************************")
      },
      network_id: 3,
      gas: 4000000      //make sure this gas allocation isn't over 4M, which is the max
    }
  }
};