Answers for "compatible composer version for php7.4.27"

your composer dependencies require a php version ">= 7.3.0"

Project or global composer.json file

{

"config": {

    "platform-check": false
}

}

download composer version 1.6.5

# Install Composer global
npm i -g php-getcomposer

# Install Composer local
npm i php-getcomposer

#Update Composer using NPM (local / gloabl)
npm i -g php-getcomposer
npm i php-getcomposer


# Update Composer from the developer (global)
composer self-update