Download the OKM installer from My Oracle Support.

1. Log in to the My Oracle Support (MOS): https://support.oracle.com/
2. Open the Patches & Updates tab (near the top of the window).
3. In the Patch Search pane, with the Search tab open, click Product or Family (Advanced).
4. Select the Include all products in a family check box.
5. In the Product field, type OKM and select Oracle Key Manager (OKM) from the menu.
6. In the Release field menu, select the appropriate OKM release (for example Oracle Key Manager (OKM) 3.3.3).
7. Close the Release menu window and click the Search button.