...
IDEA 10.5 (aka Xena) is free upgrade for IntelliJ IDEA version 10.
Download IntelliJ IDEA 10.5
...
Release Notes
IDEA 10.5 RC (build 107.52) release notes
IDEA 10.5 build 107.18 Release Notes
IDEA 10.5 build 106.561 Release Notes
IDEA 10.5 build 106.491 Release Notes
IDEA 10.5 build 106.447 Release Notes
IDEA 10.5 build 106.330 Release Notes
IDEA 10.5 build 106.273 Release Notes
...