Run composer install in the root directory of your installation. If everything goes smooth you are good to go.
Update Dependencies
In many cases you might want to be able update the code base with a single command. To acheive this just run composer update in the root directory of your installation.
Issues With Install/Update
In the real world things go wrong. If you run into problems while installing or upgrading Microweber you can see the troubleshoot guide or ask online. We're probably on the same sites as you.