Looking to upgrade our version of concrete5 but having problems confirming what the current version actually is.

When I look at the Environment Information, it states the current version is 5.5.2.1. However, if I go to the Download Update area it states we are "Currently Running 5.6.0.2"

How should I approach upgrading to 5.6.2.1? (I previously tried to update just through the admin interface but had to reverse changes because of multiple database errors)

Thanks!