incompatible with your PHP version

[pishguy]

how can i install this package on PHP 8?

root@2b808f246882:/var/www# php --version
PHP 8.0.3 (cli) (built: Mar  5 2021 07:53:56) ( NTS )
Copyright (c) The PHP Group
Zend Engine v4.0.3, Copyright (c) Zend Technologies
    with Zend OPcache v8.0.3, Copyright (c), by Zend Technologies
    with Xdebug v3.0.0, Copyright (c) 2002-2020, by Derick Rethans
root@2b808f246882:/var/www# 

[kubawerlos]

You can't, you should use Composer 2 now, so you don't need this plugin.