Here are the steps required to install the Print Science Designer extension for Magento v2:
1. Download the extension package
2. Upload the extension package to the following directory: /app/code/
If the sub-directory /code/ does not yet exist, you should create it. Unzip the extension package. After the extension is unzipped, you should see the following directory structure:
/app/code/PrintScience/Personalization/
3. Open a command line interface, navigate to the root of the Magento installation and issue the following 3 commands:
php bin/magento setup:upgrade
php bin/magento setup:static-content:deploy -f
php bin/magento setup:di:compile