Can't bring up vagrant containers using course instructions

[HectorOses]

Course instructions tell to do:

git clone https://github.com/wardviaene/docker-swarm-demo
vagrant up manager
vagrant up agent2
vagrant up agent3

Apart from agent3 not existing and agent1 being instead in vagrant file. The following errors appear when bringing up:

$ vagrant up manager
==> vagrant: A new version of Vagrant is available: 2.2.6 (installed version: 2.2.5)!
==> vagrant: To upgrade visit: https://www.vagrantup.com/downloads.html

Bringing machine 'manager' up with 'virtualbox' provider...
There are errors in the configuration of this machine. Please fix
the following errors and try again:

shell provisioner:
* `path` for shell provisioner does not exist on the host system: C:/Users/hoses/Documents/Vagrant/docker-swarm-demo/docker-swarm-demo/docker_install.sh