DHIS upgrade from 2.0.5 to 2.14

Good Day Every one

I want to upgrade DHIS 2.0.5 to a new version(2.14) which is more advanced with a lot of improved features. I cannot see a clear manual for doing the upgrade like scripts for all the
versions from 2.0.5 to 2.14. How can I upgrade without continuously moving version by version. Thanks for your help in advanced…