Following instructions are applicable starting from ScandiPWA version 4.
ScandiPWA requires having Magento 2 module (backend) and ScandiPWA extension (front-end) to be separated and both installed for extension to work.
Magento 2 module installation instructions
ScandiPWA extension installation instructions
ScandiPWA extension manual Installation guide
How to migrate and install extensions from ScandiPWA 3.x to 4.x version
Purchased extension archives are available in My Account > My Downloadable Products section.
Generate Composer key pair in My Account > Composer Auth Keys section. Available Composer packages are listed in My Account > Composer Packages section.
Generate NPM authentication token in My Account > NPM Auth Tokens section. Available NPM Packages are listed in My Account > NPM Packages section.