composer install says Nothing to install or update

[binchentx]

I have down loaded the wrapper from https://github.com/ActiveCampaign/activecampaign-api-php on my laptop with Windows.
My php project already has a vendor folder, so I created a new folder for cativecampaign.
Then I loaded composer.phar with the composer.json from git
curl -sS https://getcomposer.org/installer | php

I run the following install all in the same folder
php composer.phar install

It created a new vendor folder inside my current folder, which has generated autoload.php file and a composor folder.
I do not see see any generated activecampaign folder. Is it because the command has "Nothing to install or update"?

C:\C2\c2educate-admin\vendor\activecampaign>C:\xampp2\php\php composer.phar install
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Writing lock file
Generating autoload files

[RTSchriner]

I had the same problem trying to install the package following the instructions.

Did you try running composer require activecampaign/api-php?