+vue+create+is+a+Vue+CLI+3+only+command+and+you+are+using+Vue+CLI+2.9.6.+++You+may+want+to+run+the+following+to+upgrade+to+Vue+CLI+3:

To upgrade to Vue CLI 3, you can follow these steps:

1. First, make sure you have the latest version of Node.js installed on your machine. You can download it from the official website (https://nodejs.org/).

2. Once Node.js is installed, open your terminal or command prompt and run the following command to uninstall the global Vue CLI 2.x package (if you have it installed):

   npm uninstall -g vue-cli

3. Next, install the Vue CLI 3.x package globally by running the following command:

   npm install -g @vue/cli

Note: The '@' symbol is used for scoped packages in npm.

4. After the installation is complete, you can verify that the upgrade was successful by running the following command:

   vue --version

This should display the version number of Vue CLI 3.x.

5. Finally, you can create a new Vue project using the Vue CLI 3.x by running:

   vue create project-name

Replace "project-name" with the desired name of your project.

These steps will help you upgrade to Vue CLI 3 and allow you to use the "vue create" command.