We recommend a full backup before the installation. In most common case, just delete folder with previous version redmine/plugins/redmine_questions and copy new version to the same folder redmine/plugins/redmine_questions
Note: All data will be saved after update from previous versions.
Here are common steps for Questions plugin upgrade (all commands should be executed from Redmine app root folder ex. /var/www/redmine, that folder contains config.ru file)
Delete previous version
cd /var/www/redmine rm -fr plugins/redmine_questions
Copy and unarchive new version
cp redmine_questions-[version]-light.zip plugins/ cd plugins unzip redmine_questions-[version]-light.zip
Install required gems
cd /var/www/redmine bundle install
Migrate plugin tables
bundle exec rake redmine:plugins NAME=redmine_questions RAILS_ENV=production
Restart Redmine app
For Phussion Passenger just touch restart.txt file
touch tmp/restart.txt