I was inspired from this document:
http://cache.freescale.com/files/microcontrollers/doc/user_guide/KDSUG.pdf?fsrch=1 , page 6
To install the Kinetis Design Studio software development tools on an Linux Standard Base (LSB)-compliant system, use the .rpm package file.
$ sudo rpm -Uvh kinetis-design-studio-3.0.0-1.x86_64.rpm
Preparing ... ########################################### [100%]
1: Kinetis Design Studio ########################################### [100%]
This will install the Kinetis Design Studio software development tools to the default location (/opt/Freescale/KDS_3.0.0).
if this is wrong, you should probably update the guide....
I was in a hurry to get the linux environment up and running so ditched my CentOS 7 efforts in favour a Ubuntu 14.04.
regarding the rpm file: our firewall proxy decided to cancel the download at some point. your assumptions are correct: the rpm file was broken.
thanks for the attention!