According to the official document http://www.redmine.org/projects/redmine/wiki/RedmineInstall to operate, in fact, there will still be many problems.
After installing Ruby
The key is to set the proxy
Such as:
set http_proxy=http://46.243.114.226:3128
or:
gem install rails -p http://46.243.114.226:3128
Moreover, the http proxy found is sometimes not stable, and the entire installation steps are completed after several replacements.
Execute in step 4
bundle install --without development test
Be sure to cd to the root directory of redmine first.
Also install DevKit, also following the documentation instructions.
Finally, refer to the following link to complete the use of thin to start redmine and configure it as a windows service.
http://www.redmine.org/boards/1/topics/32693