Installation error

[EvanSchleret]

I follow guide installation : http://docs.diamantedesk.com/en/latest/installation-guide/

my version php : PHP 7.2.19-0ubuntu0.18.04.2 (cli)

1- git clone -b 1.0 https://github.com/eltrino/diamantedesk-application

2- php composer.phar install

I get this errors :

Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Your requirements could not be resolved to an installable set of packages.

Problem 1
- Installation request for eloquent/composer-npm-bridge 2.1.1 -> satisfiable by eloquent/composer-npm-bridge[2.1.1].
- eloquent/composer-npm-bridge 2.1.1 requires composer-plugin-api 1.0.0 -> no matching package found.
Problem 2
- eloquent/composer-npm-bridge 2.1.1 requires composer-plugin-api 1.0.0 -> no matching package found.
- diamante/front-bundle dev-master requires eloquent/composer-npm-bridge ~2 -> satisfiable by eloquent/composer-npm-bridge[2.1.1].
- Installation request for diamante/front-bundle dev-master -> satisfiable by diamante/front-bundle[dev-master].

Potential causes:

• A typo in the package name
• The package is not available in a stable-enough version according to your minimum-stability setting
  see https://getcomposer.org/doc/04-schema.md#minimum-stability for more details.
• It's a private package and you forgot to add a custom repository to find it

Read https://getcomposer.org/doc/articles/troubleshooting.md for further common problems.

[catbadger]

seems the team does not care. sad.