• https://rubyinstaller.org/downloads/

  • as of 2021-02-18: Ruby 2.7.2-1 (x64) (without devkit)
  • install MSYS2 base installation
  • reboot computer!

Asciidoctor is a Ruby tool and is therefore installed via Ruby's packet manager gem

• https://asciidoctor.org/
• https://asciidoctor.org/docs/asciidoctor-diagram/
• https://asciidoctor.org/docs/asciidoctor-pdf/

   $ gem install asciidoctor
   $ gem install asciidoctor-diagram
   $ gem install asciidoctor-pdf

If no direct network connection is available, you can use Bundler.io to export packages and their dependencies from an online PC.

1. Download bundler from rubygems (latest version at the moment is v2.1.4) and install it locally via

  $ gem install --force --local bundler-2.1.4.gem

2. Download our ready-made Bundler package for local (offline) installation containing all necessary gems. Extract the archive to a local directory.

3. Run the following command from the above directory where the Gemfile, Gemfile.lock and the /vendor/cache/ subdirectory are available:

  $ bundle install --local

See PlantUML