I’m currently using RT 3.4.5. I’d like to upgrade it. I was
wondering if I should just go straight to 4.0.x or go to 3.6, then
3.8, and then to 4.0. What would you suggest?
Going straight to 4.0.x is fine. There are a number of important
database upgrade steps you need to do, so read all of the README and
docs/UPGRADING-3.4, docs/UPGRADING-3.6, docs/UPGRADING-3.8,
docs/UPGRADING-4.0 and docs/UPGRADING.mysql if it applies to you.
Thomas