How to upgrade from Gitlab CE Omnibus version 8.0 to 10.2

Hey guys,

I have no clue how to do this large of an upgrade, from 8.0 to 10.2. I have a Gitlab installation (CE Omnibus) on our server and we’ve tried doing an upgrade before I discovered that upgrading this large of a version gap is impossible to work properly.

So, what incremental versions do I need to jump, and how do I actually upgrade to a specific version at a time?