Note: Please note that before installing the Invoices plugin, you have to install the Contacts (CRM) plugin first because it is required for Invoices to be able to work. You can use a Free (Light) version, which would be enough for the proper functioning of this plugin.
Linux Redmine Bitnami Stack
1. Go to plugins folder
$ cd /opt/redmine-[version]/apps/redmine/htdocs/plugins
2. Copy plugin there
3. Unarchive plugin
$ unzip redmine_contacts_helpdesk-[version]-pro.zip
4. Run use_redmine script
$ cd ../../../ $ ./use_redmine $ cd apps/redmine/htdocs
5. Intall required gems
To avoid gem freezing during installation use option --no-deployment
$ bundle install --without development test --no-deployment
6. Migrate database
$ bundle exec rake redmine:plugins NAME=redmine_contacts_helpdesk RAILS_ENV=production
7. Restart Redmine application
$ sudo /opt/redmine-[version]/ctlscript.sh restart