How to upgrade Hexagon DSP SDK 3.5.1 to 3.5.2

As Hexagon DSP SDK 3.5.2 is available, how can I upgrade it from 3.5.1 to 3.5.2?
Uninstall 3.5.1 and install 3.5.2, or install 3.5.2 will update it from 3.5.1?
Thanks.